What software will compare an unknown subject with a known subject?

I have a photo of a person who may be my wife's birth father from the 1960's. We have current photos of the man today. I am wondering if there is any software that will do a comparison between the photos and tell if they are the same person or not?What software will compare an unknown subject with a known subject?
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1. Are you retarded?

2. Are you mentally disabled?

3. Have you watched too much porn lately?

4. Are you gay?

5. Can u plz stop asking stupid questions?

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