Has it come to anybody's attention that there seems to be an odd relationship between speedsters and twins? It seems like a weird theme of something. I mean, Barry and Iris have twins, Wally has twins, Barry sometimes is a twin, Keystone and Central are twin cities, and at Marvel Quicksilver is a twin and has a speedster twin nephew. Also, you've got the Twin Paradox where time dilation is proven when one twin moves at superspeed; being a possible explanation as to why a speedster may not age.