I've seen that the biggest obstacle is that retired people don't want to be idle, and start bothering their partners for things to do instead of looking for a h

I've seen that the biggest obstacle is that retired people don't want to be idle, and start bothering their partners for things to do instead of looking for a hobby that relieves their boredom. Help if asked/needed, but seek new interests that don't involve your partner, and let them find their own. If you coincide, awesome, but don't force it.