Does it mean you look “matronly” if you’re asked if you have kids?

I’m in my 20s and married but we don’t have kids. I’ve been asked this a couple of times by 30-something year old coworkers and I for some reason I don’t like it. I would personally never ask someone that because I assume if someone has kids, they’ll talk about them pretty early on. Is this a typical thing? It honestly makes me feel self conscious because I wonder if I look worn out/tired/older/have that stereotypical “mom” look? I find myself pretty and think I look my age, it maybe I’m wrong.