My mother did, but it really had no impact one me the same way this fetish does. A lot of the appeal of this fetish comes from the humiliation inflicted from seeing your own mother choose somebody over you, pushing aside a supposedly all powerful mother's love to satisfy herself, even knowing that it causes her son pain. I don't think a son would get that feeling of being passed over by their mom took a lover their own age. That's expected, and most parents do it.