His wife was Cloithfinn, and they had six daughters, Derbriu, Eile, Mugain, Eithne, Clothru and Medb, and four sons, a set of triplets known as the three findemna, and Conall Anglondach.
My grandmother had eight children by age 26. Is your only concern the number of children?
My girlfriend's mother had 4 children by 23 and that was not that many years ago. My ancestors were married by 16 or 17 and had borne 14 children by early 30s.