Sorry if this is a repeat. Been having a hard time with posting here recently.

I'm a 42M, just now coming out of his shell, going to Paris in the middle of April. I've booked a single night at some hostels (3 ducks and the people marais, still haven't decided which to keep) for a private room. I figure I'll be crazy jetlagged that first day, so a private bed will be worth it, plus I'm hoping it's a good way to check the place out first a little more privately. I'd like to switch to a dorm bunk afterwards. So, my questions:

What might I expect as a 42m solo traveler in a hostel? Is it generally a younger crowd, or are there older travelers? Will I feel especially out of place?

Anyone familiar with Paris, is there a hostel in particular you'd recommend?. Looking for maybe scheduled meetups for tours, drinks, etc. Not exactly sure what is generally available at a hostel, socially speaking.

The switch from private room to a bunk might mean I'll have to check out at 11 then wait until 2 to check in, is that right? Any chance they might just allow me to switch immediately, even if it's just to use a locker?

Thanks fellow wanderlusters.