The ageing workforce argument has been made so often that most leadership teams have stopped hearing it.
Everyone accepts that more people will leave industrial, energy, life sciences, and technology businesses over the next decade than will join them.
The figure goes on a slideshow for a leadership meeting, everyone agrees it is a concern, and nothing is put in place.
One reason it stalls there, is that the problem keeps being described in headcount terms, and headcount is something businesses believe they already know how to handle. Forty people leave, forty people are hired, the org chart survives the year.
What that framing leaves out is depth. The people going are the ones who have been in the sector longest, and the people arriving to replace them are, earlier in their careers.
That distance between the experience walking out and the experience walking in is the wisdom gap.
of organisations do not consistently capture knowledge from soon-to-be retirees
of C-suite respondents are very worried about the knowledge loss coming
workers approaching retirement for every new entrant under 25 in energy
Sources: APQC survey of 1,000 professionals, 2025; International Energy Agency, advanced economies.
What does the data say?
APQC surveyed 1,000 professionals in 2025 and found that 92% of organisations do not consistently capture knowledge from soon-to-be retirees, while 58% of C-suite respondents said they were very worried about the knowledge loss coming.
The concern is already at the top of the business, and almost none of it has been converted into a process. Awareness is not the constraint here, which is what makes the wisdom gap different from most workforce issues.
The same survey points to why. Time pressure is the reason most often given for knowledge going uncaptured: the handover competes with the day job, and the day job wins.
Nobody sets out to lose 30 years of judgement in a notice period, but that is the default outcome when capturing it is left to the goodwill of the person leaving.
So, the honest reading is not that leadership teams are ignoring the retirement wave. It is that the worry sits with people who have no mechanism to act on it, and the roles most exposed are usually the ones furthest from HR’s line of sight.
We map who could replace your most exposed roles, while the seat is still filled.
Why is the wisdom gap opening now?
There is a clear trend running across several industries. The people who will retire between now and 2035 are in post today, and the younger cohort behind them is smaller in every one of these sectors. Four sectors show it most sharply.
Life sciences have the narrowest replacement pool. Research from Experis and ManpowerGroup found more than 20% of workers across pharmaceutical sciences and medical manufacturing are 55 or older, concentrated in regulatory affairs, quality, and clinical development.
A regulatory affairs director cannot be recruited from outside the sector, because the qualification and the relationships with regulators take years to build. The replacement must come from a handful of direct competitors.
Energy is ageing fastest. The International Energy Agency counts more than two workers approaching retirement for every new entrant under 25 across advanced economies. Analysis of the UK nuclear workforce by Imperial College found 53% of employees are over 45, against 20% under 34.
Technology shows the same pattern in a sector everyone assumes is young. SEMI, the industry association, reports that one-third of US semiconductor employees are 55 or older. That is happening while investment in new chip plants sits at a record high and electrical engineering enrolment has been falling for years.
In industrial and engineering, the ECITB’s 2024 Workforce Census showed the industry expects to grow 11.7% by 2027, while 14.7% of the workforce is already over 60 and only 16.8% is under 30.
Those four sets of numbers all say the same thing: they tell you roughly when the most experienced people in each sector will leave. What they do not show is what goes out of the door with them, or how much worse the decisions get once it has.
Where does the wisdom gap hurt first?
At the leadership layer, because that is where the knowledge is least documented and takes longest to rebuild.
A skilled technician can be trained in three to five years through a route that already exists, is funded, and has an institution behind it.
Someone who can handle an inspection, a stalled project, and a difficult conversation with a regulator in the same week is the product of two decades of accumulated judgement, and there is no programme anywhere that produces one.
What leaves with that person appears in no handover document. Think of the customer who nearly walked three years ago and the specific reason they stayed. Nobody logged that as knowledge, so nobody thought to pass it on.
The successor inherits the account and none of the history and finds out what they are missing the next time the relationship comes under strain.
Why does nobody own it?
Because the wisdom gap falls between three functions and lands properly in none of them.
HR holds the demographic data without the technical judgement to read it. Operations knows precisely which individuals cannot be replaced, and is rarely asked to plan beyond the current year. The leadership team files the whole thing as a workforce issue rather than a commercial one.
The roles carrying the most exposure in the business end up belonging to nobody, which is also why the question of who owns it never gets settled.
What should you do about it this year?
Start with the ages and the experience concentrated in your most critical roles rather than the workforce as a whole.
List the roles a single retirement would break.
Ten roles where one departure would stall a project, break a customer relationship, or put a licence at risk tells you exactly where to spend attention.
Map the outside market before anybody resigns.
For the roles on that list, build a live view of who exists outside the business while the seat is still filled. Around 45% of the executive searches we run are confidential for exactly this reason. Knowing the six people who could do the job, and whether they would take a call, turns an emergency into a scheduled task.
Budget for overlap where the calendar allows it.
Paying two people for two months costs less than an undocumented handover, and it remains the only reliable way to move knowledge that was never written down. It is also the only version of knowledge transfer that senior technical people tend to take seriously, because it happens through the work rather than through a template.
Ask the people on that list about timing.
Most businesses learn a retirement date when the notice arrives, which is about 12 weeks of warning. A straight career conversation, held once a year and framed as planning rather than an exit, is what turns a knowable timetable into a date you can actually work to.
Know what would move a replacement.
For senior technical leaders in these sectors, salary is rarely the deciding factor. Our 6F Methodology looks at six dimensions: fit, freedom, family, fulfilment, fortune, and future. Someone who is content where they are tends to move for more autonomy, a shorter commute, or a stake in something being built.
How we can help
The wisdom gap is one of the few hiring pressures with a fixed and knowable timeline. Anyone retiring in 2029 is already on your payroll, and you can find out when they intend to go by asking them.
What almost nobody has is the other half of the picture, which is who exists outside the building. That is what SD Hiring Intelligence was built to give you. It maps your own market: the people who could do your most exposed jobs, how many of them there are, which companies and locations they sit in today, what they are paid, and what would make them move.
Use it two ways. Run it against the roles where you can already see a retirement coming, so you know the replacement pool while the seat is still filled. Or run it before you open any critical role, so the search starts from an informed position.
Wisdom gap FAQs
What is the difference between a skills gap and a wisdom gap?
A skills gap is a shortage of people who hold a defined, teachable capability, and it can be closed through training, apprenticeships, or hiring. A wisdom gap is a shortage of accumulated judgement, built through years of context, relationships, and decisions that went wrong once. Training does not close it, and a full headcount can hide it completely.
How do I measure the wisdom gap in my own business?
Start with the roles rather than the headcount. Identify the positions where a single departure would stall a project, break a customer relationship, or put a licence at risk, then look at the age, tenure, and stated plans of the people in them. That list is the exposure.
Which sectors are most affected?
Energy, life sciences, industrial and engineering, and semiconductors, because all four depend on knowledge that takes a decade or more to build and sits with a workforce that skews older.
Can knowledge transfer programmes solve it on their own?
They help with the part that can be written down, which is the smaller part. APQC found 92% of organisations do not consistently capture knowledge from people about to retire, and time pressure is the reason most often given. Paid overlap between an outgoing and incoming post-holder moves more than documentation does.
When should we start a search for a role we know is retiring in two years?
Map the market now and run the search when the timing is agreed. Market mapping while the seat is still filled costs nothing in disruption and gives you a named pool. Waiting until the notice lands compresses a 20-year replacement problem into a 12-week one.