My partner is in a different stage of life

My partner is 15 years older than me and that was so far never a problem, but now that he is over 60, I notice that we are really in a different stage of life.

My partner is thinking about slowly quitting his job, while I am fully enjoying my career now that the kids are bigger and need less care.

I notice we are slowly drifting apart and I share less with him. On the other side I don't want to lose him. I do love him. I just miss the connection with him at the moment. I feel more or less in a split with it.

Who recognizes this and what has helped you?