You should really look into biometric authentication - and how it doesn't significantly improve security as concluded by pretty much every security expert worth listening to. I need your fingerprints? If I can't find a photo online I can print them from guess who's going to have to learn a new way to tie their shoes. Retina? if you've had an eye exam since it went digital there's a record - and these companies lose their database(or copies of) all the time so that's spoofable via several techniques - else guess who's getting a new dog. The list goes on.
For a sane authentication you want something that is difficult to copy or statistically infinitely improbable for unauthorised use if copied. Preferably something not left in five million places and held and or accessible by a few billion people. It also wants to actively avoid encouraging harm to reach a goal.