@dgarretson , right you are.
It seems that it is not a problem with your math skills so much as it is a problem with my reading skills.
I read your second number to be how many years have you seriously exercise your purchasing power on audio, not at what age did you start. So change my 27 to a 28. I’ve been playing in the high end for 27 years now, I started at the age of 28.