There's quite a few MILFs in the game, and real MILFs given that several of them are the mothers of other characters you meet and know. There's only so many scenes so far with those characters where the MC is an active participant, but there are several scenes. There's the gardner Louise, Maddy (Dr's wife - repeatable BJ only so far), Lola, Roy's mother (repeatable full sex and creampie), Betty (Steve, Molly and Margot's mother - repeatable massage with happy ending), Alicia (the Uni Principal and Math teacher - one-off full sex so far), and all the signs that MCs own mother may be do-able later (just some NTR stuff so far).
There's plenty of other MILFs in the game, and again, many of them have actual kids in the game too. Several of these seem almost certain to have routes or scenes with in future. However, you have to appreciate the mammoth scale of this project - there's so many characters, so many locations, so many potential routes, and this game is a work in progress. Lots of characters that almost certainly will have lots more content in the final game just don't have any yet because the devs have to prioritize their time on where they think it will do the most for the most.
Given that the game has pretty extensive pregnancy mechanics, the list of who is or isn't a MILF may also be rather a matter of interpretation and choices.