>

There is a HUGE difference between 

I still want to be active and do something engaging with my time in retirement! 

and 

I cant miss any time this week or I lose my house
"We're scrapping all wheelchairs because people want to walk." >

This. A lot of people don't work jobs that you can do at 70. 
You can sit in Congress until the coroner collects your body (average age is 60). But you're not working in an Amazon warehouse at 65.