Did anyone else shrink?

I know I was 5'11" (height, not ahem, length) at one point, likely in HS or college and when my 14 year old caught up to me recently, I was like cool. However, I was quite shocked at his recent pediatric appointment to find out he was "only" 5'9"! I had the nurse measure me and I only had half an inch on him. I asked the doc about it and he's like yeah, people shrink all the time starting as early as their forties. I was like wtf?!?!?!! I'm sad...