Especially in a world where kids were born when the parent was in late teens or early 20s, rather than now when average age is 28 and pushing higher. This mean

Especially in a world where kids were born when the parent was in late teens or early 20s, rather than now when average age is 28 and pushing higher. This means first grandchildren in early 40s (rather than late 50s), and first great grandchildren by mid 60s (rather than mid 80s)