Mathematics is notoriously famous for being dominated by the young. In more recent times, as more depth is required to break new ground, mathematicians have be

Mathematics is notoriously famous for being dominated by the young. In more recent times, as more depth is required to break new ground, mathematicians have been making breakthroughs at slightly older ages... but they started just as young. In a sense, it's even more exclusive now. The current experts are still extremely bright people who developed exceptional abilities in their 20's, but then they had to keep on grinding further just to get caught up with the current state of their specialty. In fact, the situation with chess is very similar. I'd say go with either nurse, or tax accountant since they are in demand and still pay well even if you don't have sufficient talent and/or early training to become the best.