At what usual age does a healthy woman lose her ability to give pleasure to a man?

Never: There is no age range to this. It depends on the woman, the man, and what is meant by "pleasure, " for both. If you mean sexual pleasure, ability to experience this can be affected by a variety of things in both men and women -- including medications and depression. Loss of interest in one's partner can be a different issue, and may come with relationship discord. See your doctor for help.