"Pushed to the Limit", by UFO, is about maintaining the rock lifestyle instead of giving in to "age-appropriate" behavior:
...I still love women, sex and fancy cars...
...I'm just not ready for the shade of an old oak tree...
My doctor says it ain't right
for a man my age to fight
he don't get it, he ain't in it, I'm pushed to the limit
...kiss my ass, I'm still alive
John Fogerty's "The Old Man Down the Road:"
He take the thunder from the mountain
He take the lightning from the sky
He bring a strong man to his beggin' knee
He make the young girl's mamma cry
Many rockers from the 60's and 70's are still alive and kicking, and definitely count as this trope.
Mick Jagger, for instance, has four grandchildren, and has only gotten more badass with age. The guy continues to live up to his legend as a pioneer of rock, still is in great shape, and can still dance like he's still in his twenties. Put it this way: there's a reasonAdam Levine and Christina Aguilera aspire to have "Moves Like Jagger." His latest project? A duet with Will.i.am of the Black Eyed Peas, a Rock/R&B/Techno fusion song called "Go Home." And it sounds awesome.
If Mick counts as one, so certainly do the rock, R&B and blues musicians from The Fifties and earlier that influenced classic rockers like Mick, along with many jazz, folk, country, bluegrass and country musicians. Chuck Berry, Jerry Lee Lewis, Fats Domino, Little Richard and other rock pioneers still tour regularly, often still with a lot of the fire that they first demonstrated in their prime.
Alice Cooper has made it part of his shows to die on-stage. During his latest tour, he does it 4 times. 4 times per show, that is. And he's still alright.