[lurquer]

> We all waited till we were past 35 to have kids.

Many people were grandparents by that age 150 years ago.

I too have many friends who waited until their 30s to have children. Most ended up in IVF (or adopting.)

Fertility (not precisely the right term, but one commonly used) charts — based on age — are very steep. After the peak in the early to mid 20s, it plummets very quickly. For women, anyway.

The low-sperm count issue, on the other hand, is very curious... not entirely sure if they have a grip on the true cause.