Party? Based on my understanding they’re not even old enough to buy beer!
If they do party (with beer or without), try not to be the grumpy neighbor who calls the cops on them. That’s a sure fire way to earn the ire of the neighbors.
Unless the party is seriously annoying, dangerous, or spills outside their property line, of course
The pit bulls would make me suspicious, true. Otherwise, if they’re 20-21, maybe they finished school early. These days, the right degree can get you $60k+/yr just out of college, which is enough to afford $1400-$1500/mo ($3000 by two people) in rent if you want to spend your money on rent.