Reproduction problems! Problem resolved.

When do these characters begin to reproduce? I have 5 adults, 3
female & 2 males, and have tried different combinations, but still no
babies.

Food is 859. Tech points 9672.

Level 2 Farming & Engineering
Level 1 everything else

The dam has been built, garden planted, hut(s) built.

Would someone please tell me what I'm supposed to do before
everyone on the island dies of old age?

Thank you!

After acquiring level 2 Exploration, the situation resolved itself.

The people have to both be 21 or older before they will reproduce.