At what age did we stop using "and a half"?

My bike is 3 and a half and I'm 59 and a half. When riding the bike I feel like 25 and a half.

First bike was a brand new 1964 Honda 50 when I turned 15. I don't count the Sears moped I had before that.


Bob 2005 America, 904cc - sold. 2014 Trophy SE.