Evolution, in short, favors nubile females who still look as though they have a great many years of fertility ahead of them.
British Dictionary definitions for nubile
nubile
/ˈnjuːbaɪl/
adjective (of a girl or woman)
1.
ready or suitable for marriage by virtue of age or maturity
2.
sexually attractive
Derived Forms
nubility (njuːˈbɪlɪtɪ) noun
Word Origin
C17: from Latin nūbilis, from nūbere to marry
Word Origin and History for nubile
adj.
1640s, "marriageable" (said of a woman), from French nubile (16c.) or directly from Latin nubilis "marriageable," from stem of nubere "take as husband" (see nuptial). In sense of "young and sexually attractive" from 1973. Related: Nubility.