At facecomparisons.com, in an article written by Joelle Steele, called How To Accurately Check An ID Using Facial Features To Verify Photo IDs, they set out how people can manually be checked against an image on an ID, which is relevant when comparing a subject to an image located online. As well as checking what features match, you need to be aware of what features are easily & regularly changed and what features to ignore.
Facial Recognition / Image Comparison Sites
AWS requires an account, whilst some of the others are not brilliant but better than nothing.
Making Someone Look Older In A Photograph (not great but might help)