I'm talking about someone who simply refuses to walk. When my mother was 55 she stopped driving. When she was 60 she stopped walking. At least beyond her door. Whenever they left the house my father pushed her in a wheelchair. He died 16 years ago and I've been her caregiver. On numerous occasions she's been in physical therapy in hospitals and she does great. Then she comes home and oops. She can't walk. She is now 90.