So...unless it exists and I can't figure it out ( a VERY LIKELY possibility :P ) It would be at the very least "neat" to have, but in my mind useful depending on how you set your world up, and what ratings you use or don't use, or stats only, etc etc...
To be able to have a field that shows the players age relative to the league average age? This would have most use for evaluating players stats in the minors, and just getting another data point to paint the picture of a player you are looking at.
Maybe it's in the game and I can't find it, but if it isn't, I'd like to hope it is something that could be added in a patch and not take a whole new version of OOTP.
( not that I wouldn't still be playing 23, and buying 24 :P Been having a blast so far playing around and experimenting with settings and such before I settle into a "main" world at some point. )