This picture might scare you. It's not that the person on the left is that sickly for her age. It's that the person on the right is very healthy for her age. Whenever I see people in their late 60s, to 70s, and 80s, who are no longer physically capable, I hear someone say, well that's normal for their age. Or they are just old...
It reminds me of my dad who's almost 90. Being diagnosed with cancer more than a year ago, he still seems in better health than most people 30 years younger.