I prefer the random drops though, even if they can end up beeing massive.
Having a player of some age -might- work out fine for some time, but all of a sudden he cannot catch a ball. Sounds pretty damn realistic to me. The "predictable" stuff would make age only a accountable size for the tables. By making age drops random you get a gamble there - just make sure everybody knows what he´s going to get.
Zwei Dinge sind unendlich, die Dummheit und das All...