My DH retired at 60, 6 years ago and when he decided to do so my first comment was "I am not your hobby". And then he asked what was he going to do. I suggested volunteer work within the industry which led to volunteer work in the community using his strengths. Volunteer work was the saving grace for us. It gives him something to do and it gives him something to talk about at dinner.
He also reconnected with neighbourhood friends who were retiring at the same time and they hike and ski together.
Someone upthread mentioned having something to wake up to that requires having breakfast and a shower is important and necessary and that is to true for my DH.
Q