Non Doppelganger

I found the doppelganger for my doppelganger on my trip to Massachusetts! But I don't think that's the case. He has a similar hair style, facial structure, glasses frames, and a great sense of style. But that's not the creepiest part of all, they have the same middle initial and last name! To be honest, it crossed my mind that this was an elaborate plan to fool me.
You're probably thinking that this guy must be my doppelganger too. But I don't think my doppelganger's doppelganger meets my doppelganger threshold. See scale above.
Thankfully, opposites attract.
I wonder if one can accurately recognize which generation someone is from by just their facial structure. Between how many generations would you be able to determine noticeable differences in body structure? I feel like when I watch JFK documentaries, I've seen numerous, that people had different facial structure than I see present day. Needless to say, the fashion styles were very different. That was nearly 51 years ago.
P.S. You can get a free drink for volunteering to move to another seat when asked on US Airways. I also learned that attendants are counting the number of people in each zone. I airways thought they were counting the number of empty seats to make sure everyone is on board...