I think it is a normal feeling. Retire if you really want too, if you don't, stay a little longer.
If you planned a long, extened cruise- say a 21 day with a week of pre-cruise travel, a week of post-cruise travel, then a couple weeks to catch up at home you would learn two things. How they made out with out you and how you made out without them. If you enjoyed being gone then the decision has been made.
p.s. I'd be happy to go along with you and the Mrs, as your personal attendee. You know, check the room to make sure the steward has champangne on ice, that housekeeping did a proper job, save your pool chairs, make sure you are on time for shows and excursions. Just say the word and I'll be right there.