When Annabel Samimy, 47, agreed to visit a dance club with friends she wasn’t sure she could keep up with the 20-somethings. Luckily, she didn’t have to.

Retroclubnyc’s throwback theme—Long Island Iced Teas and Sloe Gin Fizzes are on offer, along with ‘70s and ‘80s hits—attracts the 45-and-over set. Ms. Samimy and her husband, who have three school-age children, got home well past their self-imposed midnight curfew. “You don’t go to clubs after you have kids, but then they get a little older and you want to reclaim your...