What's it like to visit a hostel as a retirement age man in America? Do you get any weird reactions or are they welcoming to you? Do you see many Americans your age? I know hostels exist here but I don't know anyone who visits them and it seems super niche here.
There is probably a joke about me always getting weird reactions from everyone I meet, but moving on...
The Hostels International US brand are affiliated with other national hostel chains, such as YHA, youth hostels association. They have a membership fee, and a set of rules. They don't offer stays to local people, you have to be a visitor to the area.
There are pretty much always other people of around my age also staying. A certain type of person tends to be attracted to hostels. Often older fitter folk, backpacking, outdoors types, health conscious folk. Having said that, there are also airheads with massive suitcases who just want to economise too.
I have met mostly mature Americans in hostels outside America, but have also met several in California hostels.
I am sure there are "party" hostels with 99% teens and twenties student clients, but I find that even in the few "independent" ones I have used, there are usually mature folk too. It was a "Youth Hostel" concept originally, now it is 100% used by folk of all ages.
As with everything, one has to cut ones cloth according to their means. I love to travel, I get a buzz from being economical, and the honest bottom line is that, like our friend Eternityroad, if I didn't use hostels and cheap motels, I would have to stay at home, so a big cheer from me for hostels!
( I used regular hotels when I worked, even staying in Times Square, back in the day...)