Hubby & I are in our late 50's....and we love to dance....not so big on the bar stuff (not huge drinkers, really) but if there's music, we'll be there till I can't keep my eyes open!
Only problem I've had with this is when we have a port/excursion the next day and hubby still insists on getting up and going to have breakfast in the dining room. But last week he actually told me that on our upcoming cruise (Carnival Freedom sailing May 13th) that he wasn't going to worry about eating breakfast in the dining room -- wooo hooo! That means at least a few minutes more sleep after a late night.
I do tend to spend more time in the cabin than my husband, however....if he keeps me up late tripping the light fantastic, I WILL be taking a nap -- whether it is on the Lido Deck chair, our cabin's bed, or in my salad at lunch. (I prefer the cabin bed!)