Getting Older Sucks

Have you ever noticed as you get older that your brain and your body are not on the same page? You brain is saying "let's do it" and your body is screaming "are you crazy". I noticed that over the weekend. Mentally I feel like I am in my late 20's, but physically I feel like I am in my late 60's. Realistically, I am in my early - okay getting closer to mid - 40's. When the heck did this happen?