On first reading I was expecting first child at age 102!
Goodness me, not the best wording, actually quite insensitive and will hit a nerve with many who have struggled and had first and only at an age higher than yours, several years higher.
Sorry, you're just asking, I know. Well for older Mums it's the same and late 30s/early 40s we are still young enough to have fun, energy but also experience of wisdom to identify and navigate situations quickly.
With having raised 2 DC the early years you know you will be facing so much energy and boundaries and at age 37, unless any medical problems it will be fine, even working FT, you're not old at all.
Some of my friends had teenage DC by the time we were blessed to have a baby; in laws were grandmas years before we became parents, other friends had babies after us. So, it's all about individual circumstances.
To reply to the question, as I have, you're not past maternal age at all and it's awful the labels given in hospital as geriatric Mums. This should have changed by now as so many other labels have.
Giving birth at age 38 then 42 to have someone come in with a clipboard within an hour to ask questions for a survey about geriatric Mums is hopefully a thing of the past.