Babies at age-
18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48
That makes me think of Topsy, who has just died in my current tribe. As a child, she was frightened by a black idol she found, and became afraid of work and crowds. When she grew up she was forever wandering off so at 18 she became a baby-maker. She carried on producing babies all her fertile life. By 46 she was a master parent and I tried her as a scientist for a while. However, I soon made her a parent again as she still couldn't concentrate on work.
At 51, now too old to have babies, I put her on research again and she eventually became a master scientist. She spent her last years as a farmer, but never got beyond adept.