What do women in their early late 50s/early 60s do if they're retired?

Depends. Depends on who they are married to. Probably should not go there.
More than before. The idea of middle age is at forty has long since disappeared. People live longer, healthier lives than ever before resulting in later retirement, working well into their late 50s and 60s. Our current economy has forced some folks including women to either stay working or go back and join the work force. If they are retired they often involve themselves in family and community and travel.