I firmly believe that you're never too old for a slumber party.
Five years ago, I thought it would be fun to have some of my old roommates over for a slumber party for my birthday and it stuck. The annual slumber party now feels like as much of a Christmas tradition as getting a tree! We sit up for hours chatting at night, just like we did in the old days, then we groggily roll out of bed the next morning and go out for breakfast. I love these ladies so much and seriously plan on still doing this when I'm 50.