Maybe there's more older guys because of the high costs involved. Unless you have a rich daddy it takes a few years to get the money together, or the credit rating necessary to borrow the money. Good on 'em, I say.
However, there is probably a practical upper limit to "old" if you are just starting out, or trying to get back in after many years out of the business. At just what age does it become a lost cause? Like fitness to fly beyond 60, it's a highly variable number depending on the individual. There's something a bit sad about pilots who hang on too long and don't admit to themselves that they are losing it. Like professional tennis, the time to go is when you are at the top of your game.