In VV1, there is no limit of age to have babies!! (in VV2 it's 50 y/o only for females) I had a villager who was nursing at 75 y/o!! \:\?
When you'll need to have 1 kid more to collect mushrooms, it will be easier to do it if the hut is built!
I had to do it once and I made my 2 villagers kissing so much that the female was near to be master parent before having any baby!! She had a baby as soon as the hut was built!!
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My Story: Aika's Memoirs in Kitten's forum