As point of comparison - mean age of first birth for a woman in 1970 was 21.4. In 2017 it was 26.8. In the kinds of places people on this site usually hail fro

As point of comparison - mean age of first birth for a woman in 1970 was 21.4. In 2017 it was 26.8. In the kinds of places people on this site usually hail from, it was near 30. (MA being oldest, at 29.3) Being quite a few years older than when people typically had kids a generation ago, is probably going to result in some differences in how easy it is. Not saying that's a full explanation either, but it's likely at least part of it.