The only thing that approaches it is in BJJ tourneys where there is usually a "Masters" or "Executive" division for people 40 or 50+. And it's there because people know that even though someone might be a brown belt in BJJ at 55, they can't compete with a brown belt at 25, just based on sheer physicality. Whereas in Aikido, somehow the older you are...the better you get at it?
Totally agree with the latter statement.
You often wonder if these older people are just delusional that they could do something, or it there is something to their jedi 'ki' mind power tricks.