Well, as Kid said, there was a poll on RSC some time ago.
But it's strange trying to decide between the two possibilities of :
(1) Which year were you born, and (2) How old are you.
Because, option 1 always stays "true" (because your birth-year doesn't change) so at first sight it seems like a better idea. But option 2 could be more useful because it kind of compensates for some people who stop playing LFS. For example, taking it to a silly extreme : option 1 that looks "true" at first, could look wrong in 300 years time, when the average LFS player would appear to be 150 years old, if you see what i mean.
Anyway i think the answer is yes it's too late now, for this time round.