Hi, Chrystine! I have an Air B and B on the first floor of my home. I just received a reservation inquiry from someone who is older than 18 but younger than 21. Upon researching the help center, I found that Air b and b states the following:
"It's against our Terms of Service for anyone under the age of 18 to create an account to travel or host. "
However, he told me that other hosts told him he had to be at least 21. So, I called air b and b to verify, and they confirmed it is 18. BUT, that made me ponder and worry about liability, wondering how far must one go, what is the Duty of Care as a mere homeowner and not a bar/restaurant owner. I believe that from now on I will stipulate 21 minimum in my listing with the option for me to be able to check IDs upon request. Meanwhile, I will do a little more research!