I have the worst baby face in the world. I legit look 12 - 14 when clean shaven, and I'm 30. I carry an insane amount of fat on my face and I literally have the smallest chin I've ever seen on a grown man, it's pathetic and it hasn't changed at all since I was like 10. I almost look like a toddler and I'm not even exaggerating.
I'm currently overweight, but even when I was in shape my face was a shapeless blob of fat.
I'm currently growing a beard and I have pretty good coverage with only a couple of small sparse patches, but it definitely looks like a full beard and it's still short. Before this I had a pretty long and bushy goatee to hide my chin.
Now with a full beard pretty much everyone calls me sir and I've noticed I get more respect. I'm not short nor am I particularly tall, but I'm pretty fat right now and look kind of strong in clothes (in reality it's almost all fat) so that helps. When I was skinny I definitely looked more like a teenager.
The upper half of my face still looks way younger than 30, but when people see a full beard they instantly assume they're talking to an adult.
I'm so grateful I have somewhat decent beard genetics, it really saved my ass. Beardfrauding is the best thing you can do if you have a toddler tier lower third.