it turns out, my dad used to be four

I am scanning photos for my dad's 70th birthday.  Which is, actually, impossible–because my dad is 45 years old.  He has always been 45 years old, and he will always be 45 years old.  Period.

Except that here I am scanning his baby photos.  Which means at some point, he must have been four.

The same age my son is now.  And he must have played the same little-boy games and built forts and run around.  My dad at this age actually looks a lot like my son.  And the truth is, even though my dad has ...