MotoGP star Valentino Rossi will be at least 41 years old when, or if, he decides to retire from probably the best racing class of any form of motorsport.
I may be a bit biased here being a former motorcycle racer, however, I'll wager anyone who sits through a MotoGP race they will be amazed at the amount of passing and sheer bravado of rubbing handle bars at close to 300km/h.
You'll often read from what I considered are the slightly ill-informed, that after your mid-20s it's all downhill from there in sports that require a high degree of hand/eye coordination and split second decision making.
Running out of puff may be the case in purely physical sports that rely on muscle mass, but not in sports where you have to use the grey matter inside your cranium. If fact, in motorsport it's typically the young and impetuous who end up in the fence, while the older, more experienced ones tend to bide their time a bit more and look for opportunities.
Rossi is a great example of the adage it doesn't matter how old you are, if you're good enough, your just plain good enough. The 39-year-old Italian recently inked a two-year extension to his contract with Yamaha to see him through to the end of 2020.