I did a study along those lines a few years ago, using my homebuilt accident database.
For my analysis, I use "Pilot Miscontrol" as a specific category. These are accidents caused by the pilot's mishandling of the controls.
A separate category is "Pilot Judgment". These are the cases where the pilot's faulty decision-making causes the accident.
Add the two categories together, and you get Pilot Error."
So...here's how the data came out, vs. the pilot's age.
This data shows Pilot Miscontrol increasing past age 80...but the *judgment* issues are less.
When you look at the overall Pilot Error percentages, it stays pretty flat through about age 80. Then, the increase in stick-and-rudder issues (reflexes, etc.) overcome the lower rate of judgment errors.
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Looking at two aspects of Pilot Miscontrol... accidental stalls (with fully functional engines) and physical loss of control of the aircraft during takeoff and landing is also interesting. Overall, as pilots age, then tend towards more cases of losing control on takeoff or landing. But generally speaking (there is a spike in the 80-84 age group) they seem to get cagier about stalls.
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But what do I know; I'm one of those guys who only come out when accidents happen....
Ron Wanttaja