Sugar daddy – a rich, usually older man who offers money or gifts to a less rich, usually younger person in return for companionship or sexual favors.

MILF – a sexually desirable older woman, though not necessarily one who has children. The term is used frequently as a descriptor of pornography featuring older women.

Toy boy – a much younger boyfriend or husband of an older woman. In male-male relationships, a toy boy characterizes the one who is used for sexual gratification.