Bad experience can sometimes happen to newer hosts who haven't learnt to vet guests/hosts who use IB without vetting .
I can only imagine how upsetting it was for you to have two bad experiences @Sacha126
I've been hosting for eight years and have only had one set of bad guests - in their 30s.
I would say about a quarter of my guests are under 25 and I've had hundreds of guests.
I can't see you've left any negative reviews for your guests so not sure who you are referring . Certainly having a hot tub does enco guests who like to party 🎉.
For me it's not about a guests age but whether they are a good fit for your place and whether they raise any red flags .
best of luck