Most of them can. My hundred year old grandma was still walking a mile a day. Her medicine was an occasional aspirin.
When you reach a certain age only those who are in decent health reach it so those people are usually still mobile.
Our orthopedic doctor and my husbands long time friend, was a serious runner. he had both hips replaced and still kept running and exercising and died suddenly just before he turned 65.
When it is your time you will go.