You can't really talk about long-running MILF careers without Syren De Mer coming up. She debuted in 2006 and built a catalog that just kept growing, with hundreds of credits across Brazzers, Naughty America, Evil Angel, and Girlfriends Films. She fits naturally into that space, both in straight and girl-girl scenes. Brown hair, green eyes, and a confident presence that feels steady rather than overplayed. She stayed active across a lot of different eras, which is not a common thing at all. Her work earned recognition too, including an XBIZ win and several AVN nominations over the years.