Diego,
BJJ is highly applicable in old age. Grappling is a bit easier on the brain case and body than, say, kickboxing, although I have to say I've had more joint injuries (grumble)... Could Helio compete with the young bucks at the highest levels? I doubt it. He's 91, after all, and competition is a far different creature. He is well known to be able to roll with his students and sons, however.
I mean, when I went to Brazil, I saw a 50 year old Black belt compete in the adult division at the worlds, and he made a **** good showing. Beat a couple of opponents before losing. Nice work! One of my previous training partners was nearly twice my age and was one of the toughest SOB's around--and you wouldn't think it a bit to look at him!
"In the world of martial arts, respect is often a given. In the real world, it must be earned."
"A stupid man's report of what a clever man says is never accurate because he unconsciously translates what he hears into something he can understand. "--Bertrand Russell
"Liberals - Cosmopolitan critics, men who are the friends of every country save their own. "--Benjamin Disraeli
"A conservative government is an organised hypocrisy."--Benjamin Disraeli