Young mind but old Body

I keep hearing people say age 50 is the new 30. What the heck is that suppose to mean? I am about to turn 50 and I sure don't feel like nor look like I am 30. I think others who have turned 50 say that to distance themselves from "old age." In my opinion now that I am almost 50 , it really means I sure wish I was turning thirty. Funny how no one wishes to be a teenager again. Those years most of us definitely lived through some scary stuff so we pick 30 because we don't want to have to live through it again. Your mind might try to say your 30 but your body functions at the age of 50 so remember that before you pull a muscle and then you will feel like your 80.