What's the name of the things that can figure out what you look like in the future.?

I really don't know what those things are called, and I want to try one. You give them a current photo of what you are now, and they use the computer to figure out what you'll look like years from now. So my questions are what are those called, and is there a free website that I can do them on. I don't have a lot of money right now. And if there is a free website what is it?What's the name of the things that can figure out what you look like in the future.?
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