My better-half and I have been together for more than 20 years. She is many years younger and plans to continue working for quite a few more years. She has been totally supportive of my transition into retirement, and the reduced stress and increased flexibility in my schedule has had an overwhelmingly positive effect on our relationship.
We enjoy traveling together, but we also enjoy traveling solo or with other friends/family. Same with our most common activities of skiing, hiking and biking. It's fun when we're able to enjoy those activities together, but most of the time I'm by myself, which I also enjoy. Sometimes, even when we're doing the same activity at the same time, we're not together, because we're just not on the same pace that day. She's also very supportive of my volunteer efforts in our community, and always tries to make time to be there, whether I'm putting on a fundraiser or just need a second set of eyes on a grant proposal. I do the same when it comes to her volunteer efforts in the community. YMMV, but it seems to be working for us.