Average age in the UK today: 39.3, 17.5% under 15
Average age in Italy today, 42.2, 13.8% under 15

Average age in Iran today: 24.8, 26% under 15

And so on. Go...figure...
Go figure???? Iran had a bloody big war where human waves were sent off with the keys to heaven , that does tend to have a bit of an impact on certain age groups .