Honestly we've got years left if we want them.
My husband has had a gruelling job as a teacher for his whole career. He's always worked flat out, giving it 150% of his available energy. Full time, 12 hour days for 25 years. ☹️
He is literally burnt out and all he wants to do is retire and do his own thing.
I, on the other hand, had a great career trajectory, starting with study and a further qualification which I got day release and study leave for. I then worked flat out till pregnancy then had two (shortish) maternity leaves. Then I worked in gruelling roles to progress whole my kids were small, plus one 3 month career break, a secondment, changed jobs twice.
After all that I sadly got royally shafted in one restructure so decided to take a further career break to study for another post-grad qualification.
The reason I'm saying all this is that my changes and breaks have kept me energised, motivated and interested.
I don't really see retirement as the golden years he sees them as. I'd rather keep working flexibly on/off or part time for as long as it's feasible.
So I think these might be two extremes but not everyone has the same trajectory in life. I'm a great believer in "It's never too late to be what you might have been".
It's not always easy but it's worth a try!
Anything I've tried and failed (the restructure thing say) I've learnt stuff.