Birthdays, for some reason, are opportunities for the people in your life to dig up old photographs of you and post them on social media. This is meant to be playful and affectionate — a gentle sort of reminder about how time passes and skin loosens, especially around the face and jaws — and mostly it’s fun to read the good wishes of the commenters. They’ll add something like, “You still got it!!!” or “What a hottie back then!!!” And it’s a nice little boost on what otherwise would be just another step closer to assisted living.