The problem that I've seen with the acronym "MILF" has nothing to do with the age range on the back side but how, instead of MILF's being in their 30's or 40's and up ... is the way that the term is being used for much younger women, and that wasn't the original intent of the word.
For example, I would consider Fawn and Reese to be "MILF'lisious" on any given day of the week
. But if they were, say, 28 well no. Too young to be MILFS in the traditional sense of the word.
The term itself is becoming bastardized from misuse.
I'm not a GILF yet, but now I find that term to be the most endearing of the bunch because of the above.
Elisabeth