Let age affect stats, it would open some interesting game dynamics. Nothing
drastic but I'd go for +-(5-10%) or so.
Just some ideas:
Very young: +dex +int -wis
Young: +str +dex +con -wis movementCostBonus
MiddleAged: +str +con movementCostBonus
Old: -dex +wis
Very Old: -str -dex +wis movementCostPenalty
Ancient: -str -dex -con +hugewis movementCostPenalty

Or something... just throwing around ideas.

And what happens when you drink a youth potion/read a book and go back to
"very young"? Shouldn't you retain those +wis etc bonuses? What about aging
specials? If you go from very young to old instantly (asmo sac), do you just
get magically more wise and intelligent on the spot?