I can't offer any quantitative insights, and I'll refrain from anecdotal observations or conjecture.
However, I'll note that there are at least 3 distinct definitions of "actuary" when it comes to retirement, and which of these you mean might affect your analysis:
Enrolled actuaries
Individuals with a credential from any of the five U.S.-based actuarial organizations
Individuals working in an actuarial capacity, regardless of whether they have obtained any credentials
For example, federal law only recognizes definition 1 with respect to ERISA and the tax code, and only those actuaries may certify a plan's actuarial report, its funded status, its PBGC variable-rate premium, or its sufficiency for a standard termination. However state law might expand that to include actuaries under definition 2 for some purposes. And some people under definition 3 might have a job title of Actuary.