Some sports you can actually still improve with age. For example with fencing, I've been whipped by more 90 year olds in wheel chairs than you would believe.

Some sports you can actually still improve with age. For example with fencing, I've been whipped by more 90 year olds in wheel chairs than you would believe. They're past the age where they'll make the olympics, but they can still hope to best 95% of semi-competitive fencers. Of course, these tend to be the nerdy sports like fencing that involve a lot of mental coordination.