Me too...I'm only 56 but the diabetes gets the best of me energy wise some days so....I'm planning for my future....which won't include any "Blah/Weak" days...because I'll just keep snicking it down a gear until it doesn't feel like a weak/blah day! LOL!
Now of course by the time I hit 80 years old?...5mph will probably be hauling azz....but on the bright side?...when I'm 80?...5mph will probably also "look like" I'm hauling azz! LOL!
It's my theory of relativity...it's all relative.