At least it doesn’t guess your weight.
Asking a fellow human being how old you look is never a good idea. If they guess too young, you can’t be sure they’re just being nice. If they guess too old, you’ll hate them forever. So thankfully there’s a website that’ll give you its honest (algorithmic) opinion. Just hop over to How-Old.net, upload a photo of yourself, and see what it says. Created by Microsoft for some reason, the results so far seem to vary from uncannily accurate (in my case) to wildly off-base. They say they’re still working out the kinks, so don’t get too mad if they’re off by a decade or two.