I think a lot of people here are imagining themselves as "seniors" without really picturing what that is like. It isn't just like being a 30-year-old male, but with wrinkles and free time.
Going up those hills is something the young take for granted. The elderly have painful joints, weak muscles, bad eyesight, slow reactions, and poor balance. I just try to imagine my grandmother going up a hill, maybe with a walker... and I mostly can't.
Invulnerability to crime is something that young males often take for granted. My grandmother would be such easy pickings. She can't run and she can't fight. She could very quietly scream after the crime had happened, but only if she doesn't fall down and get knocked out cold.
Many have poor control of core body temperature. They are in danger if the weather changes.
Many are not strong enough to carry very much. Typically you bring stuff with you when you go places. The point is often to go shopping, and of course you'd want to bring a purse. This is not something that everyone can reliably do.