I am 59, but I was 39 when I got my first BA , an R-390A . And an SWL
from about age 9. Come to think of it, I did pick up an R1155 at age 19
which served me for many years.

Now, with 30-40 BA's, I think there are a couple of parameters that
tends to bracket the age group (with notable exceptions): You gotta
have some spare money (kids moved out?) , you gotta have some room
(do.) , but also you gotta be able to do the heavy lifting. Maybe there
is also the YL/XYL factor, when did we last hear about someone scoring
on the strength of their BA-collection? "Won't you come up and see my
boatanchors?"

Best,

Clemens S.Ostergaard
Aarhus
Denmark