@Micah72 Yes, I understand that it would be frustrating when you're a responsible person who would take good care of a place, but like many things in life, the bad apples end up ruining it for the good. I certainly know lots of young people to whom trashing a place in any way would be unthinkable, and who aren't wild partiers or drinkers.
But even then, what you might not realize is that just because a bunch of 18 year olds aren't disrespectful partiers and house wreckers, very few people your age really understand how to look after a place. This a not a put-down, it's a natural state of affairs. There's few 18 year olds who have ever had to spend their money on appliances like a washing machine, or to buy nice furniture. Most have never had to pay a utility bill. They don't think about things like not putting drinks down on a nice wooden table and leaving rings that will have to sanded out and refinished, or overloading the washing machine, or running the washing machine on full load to wash a pair of pants and a tee shirt they want to wear that night. They don't think about things like not leaving towels in a wet pile to mildew so they'll need to be relegated to the rag bag and replaced. There are people of all ages who are careless like this, but it's much more prevalent among young folks, simply because they have no idea or thought about how much it may cost a host to repair things or end up with a big electric bill because guests left lights and AC on high when they were out all day and fired up the washing machine and dryer 5 times a day.
It's like car insurance- the statistics are that young men have more traffic accidents than other demographics, therefore insurance rates for young men are much higher than even for young women. You could be a super safe, attentive driver who never gets in one accident or has any traffic infraction, from the time you're 18 until you're 25, but you are still going to pay higher rates. The bad ones ruin it for the good.
Honestly, this phenomenon of teenagers and young adults wanting to rent a stranger's house for a celebration get-together is relatively new, yet has seemingly become something young people think is quite a normal request. Before Airbnb, that kind of gathering would happen by a bunch of young folks going on a camping trip, or staying at a hotel or hostel together, or maybe one of them had access to a family vacation home where that could take place.
There are listings on Airbnb, though, that allow parties- did you filter for that and are being declined due to your age, or are you contacting hosts who don't allow parties and trying to convince them that you'll be responsible?