How did senior citizens lived in the middle ages?

It was the obligation of the children to take care of their elderly parents, just like it is still today in many societies.

It was a disaster to enter "old-age" and to be childless.

I don't know what you classify as "senior citizens." In that period, the average life span was in the mid-30s. There would be few, if any, persons living beyond 65, our current deswignation for "senior citizens."

Does that help at all? Thanks for asking.