What kind of activitys does your H enjoy and activatly do? Golf,bowl,fish anything? Does he have male friends to do things with. Sounds to me like he is bored. Unfufilled not just in your R but in life. Heck it may not really have much to do with your R it may just be a overflow effect from his mounting boredom. Sounds like you have achieved most things people spend a large amount of time trying to get to. I can only imagine it creates a let down feeling. Maybe now would be a good time to set new goals to work towards achieving. Honey I want to get to a place where we can do a Eurotrip for a month. Would'nt it be nice to have a small place in the mountains or beach so when we have grandkids we can have great experiences with them. You know something to look forward to like that dream home, Putting your kids through college ect that you have already achieved.
Maybe now is not a good time to start this or maybe while you are sitting on the couch one day staring at a TV is the best time. Maybe it will help maybe it won't. Just thought I would share my thoughts