Likewise, saved up my lunch money and went to the local hardware store and bought .22, seems like shorts were about 50-60cents a box, long rifle were like .75 -80 cents.
As far as the OP perception, I can get nervous around any age at a range until you get to know them. I think there is a natural tendency for older to wonder if the younger people have the education,maturity and experience to be doing what they are doing. Your best defense is to know what you are doing and talking about. If you still get the cold shoulder, then it’s their loss.
It happens in all industries. I have worked with and for people half my age. But luckily, they knew what they were doing, but if they needed help, they weren’t afraid to listen to the older folks either.
I still remember the time the customer asked me if I was old enough to be flying the airplane ( as Captain ) I was in my late 20s. We have all been there in some form.