I'm in the same boat, aged 71, wife is 52. She's working 3 nights a week, and will retire at 55, to avoid the NHS pension shambles.
I "retired" at 65, but decided that I would keep a few clients, just nice people! (I'm a chartered accountant)
Now, in the last couple of years, they have gone bust or packed in, so I'm stuck at home, bored senseless, and looking for something useful, like mentoring.
It's a personal choice, but if you enjoy your work, I'd stick at it!!
Good luck whatever you do.