Looking like Wesley Snipes and having a katanas and trenchcoats.ok, what exactly does being half undead entail?
Dunno Medieval Europe, but studies of still-extant pre-modern societies (!Kung bushmen, various other African, Indonesian, and Amazonian peoples), find that the women of childbearing age are more-or-less constantly pregnant or nursing. .
Holy thread necromancy!
This is beyond thread necromancy. This is thread archaeology. Any minute now, a giant boulder is going to come rolling through the forums.
Monogamous high-latitude agricultural societies like medieval europe are likely to be different from polygamous tropical hunter gatherer groups, though.
My understanding is that depending on the era and social class, it was not uncommon for women to marry late, around mid '20s.