Originally Posted by winstonplum
. . . and I know that if I can call myself a legitimate 4.5 that will be the end of the road as I'm approaching forty.
At 40 4.5 isn't the end of road unless you have specific physical limitations or time constraints on practicing (which most of us do). But if you're in good shape and everything works, you have to be playing at a very, very high level before being 40 in and of itself is an issue - IMO.