Growing Shorter In Height !

A very disturbing thing happened this past week . I found I am shorter in height by an inch ! How did this happen ? I still have not fully understood the "how" of it but I have understood the why part of it. Let me start from the very beginning. I had been very happy when I had matched my father in height and was even happier when I had overtaken him in height (He is around 5'2"). Suddenly I noticed I had stopped growing taller and I measured my height using the same tape I had always used and voila ...I was 5'8" tall. I had hoped to be a six footer but 5'8"was still respectable and I was happy with it. So from that point on when anyone asked me ...I replied that I was 5'8". Till suddenly one day when joining up at a gym, I was asked for my height and weight by one of the trainers. I gave the standard answers I was now so used to giving ...But of course they wanted to double check. They check my height and say 170 cm, that's 5'7" . I am shocked ! I had remembered the 170 cm part of it. But previously somehow I had calculated the conversion to feet as 5'8". I had to find out. Go check the web and realize my fate is sealed . Most online conversion sites say the same things ... 170cm = 5'7" ! So here I am shorter in height by an inch ...And this is even before I have reached my thirties ..... Well before my sixties and seventies where curvature of the spine due to age begins !
I am still trying to reconcile myself to the fact that I will grow shorter in the future ....