Whereas, I have found that age means only one thing: slow accumulation of skill points.
I have not been able to co-relate anything between success and age.
Remember, this is a mickey-mouse internet browser game. This is NOT Football Manager. This does not have the complexity that any other console game has and certainly does not have the complexity that people on this forum give it.
This game is still in its infancy and needs serious help advancing to a state where it is worth putting money into. That being said, there are many things built into this game that mean absolutely nothing that are important in other managerial games: height, foot, age, skill (lol), Special Ability....these all mean nothing in this game. But interestingly enough, they put it in so it looks complex and worth the money, like Football Manager. It is all smoke and mirrors.
Age means nothing except skill point accumulation rates