Yes, technically speaking MILF means Mom I’d Like to Fuck and therefore all you need to be to qualify is a mom. That was never the intention of the definition though, meaning that just because you’re 19 years old and have a baby on your hip does not mean you’re a MILF. In porn terms you are still a teen then.
MILFs doesn’t have a an absolute agreed age range but rather loosely refers to all women who no longer look like they can pass for teen but also don’t yet look like they are matures. Matures being what we might typically in every day life refer to as younger grannies. Grannies in porn are typically much older ladies.
That’s why, when this cam site defines their milf cams category, they include all women between the ages of 30-49.
Oh yeah and by the way, you don’t need to actually even need to be a mom to be a MILF. All of these ‘classifications’ are purely indicative of how old you look, not even how old you really are. Except in the case of cam sites where it actually is how old you are, it’s just easier to manage that way.