My husband and I have the same age difference. I am 43 & he is 60.
We have been together 21 years & have a 13yr daughter
I would say that for the first 10 years of our relationship, it made no difference at all,w e were extremely but the last few years I've noticed a difference. He works full time in a very physical job& understandably gets tired & in the evenings just wants to 'rest' where as I would quote often like to go for a walk or go out & do something.
Some of his friends whose kids are all grown up are retiring soon/or are semi-retired but because our daughter will be financially dependant on us for at least another 8/9 years, this just isn't a possibility.
I also worry about the prospect of working, looking after elderly parents/a teenager & potentially my husband, if required, I hope he will remain healthy & this won't be needed, but it in all honesty it's not something I thought about until now.
We both work, but we couldn't afford to go down to one salary, so this is also a long term consideration. Realistically he won't be able to retire until he in well into his 70's.
I think it very much depends on your personal situation, weather you work/have kids. (Is he happy to be step-dad/step-grandad in the future) & also weather he wants to have children will be the number one issue & he may not now, but his feelings may change in 5/10 years' time.
Good luck whatever you decide!