Not old enough to have a stone tab record yet, but I can definitely feel my body getting old. Brain's been writing cheques my body couldn't cash. Had a few bad crashes on my skis this winter because I thought my legs would be in position but they weren't. 
 I know what you mean about that! 
I hate it when my brain tells my legs to do something....and my legs do....too slowly...but by then they should be setting up for the next turn.......Ummmph!....Lets see....I don't think I broke anything....Hope nobody I know saw that!