Too old to wait between kids?

Husband brought up the idea that because I’m 28 going on 29, pregnant with our first, we are possibly going to have to have back to back pregnancies.

I asked him why, he mentioned that his mom told him that we’ll probably not want to wait too long between each child. He asked if I’m ok with being pregnant for the next 4 years... I mean, yeah but at the same time I don’t feel like 28 is too late. And we want 3-4 kids.

My mom started having kids at 28, and she has four... My MIL started at 17 and has three. To each their own, right?