MILF

We are curious about something. We have seen many profiles by young(under 30), single females without any k**s and they claim to be MILFs? Isn't the first letter in MILF an "M" which stands for "mother"? How can you be a mother if you have no c***dren?? According to Wikipedia, a MILF is "a sexually attractive older female, generally between 30 and 50 years of age." How can a woman in her twenties be a MILF then?? It seems like an oxymoron like "almost pregnant" or "lite beer"? Just curious.