doppelgeezer

Finding an older version of you or a friend

Person 1:While I was waiting I thought I saw you, but they were too old.

Person 2: Oh, you found my doppelgeezer.

doppelgeezer by stewyt May 22, 2016

doppelgender 

Someone who's looks similar, but is the opposite gender

I saw Kim's doppelgender, Steve today.

doppelgender by IndoorsDave July 23, 2015