He's a legal adult and living in your property, for which you are liable.

It seems like everyone is required to live on campus unless they are adults or are families.

Only con is the notary cannot and will not explain the legalities behind the paperwork since they are not attorneys and cannot give legal advice.Another option is you can do it with an online notary via webcam (we did that a few months ago, not for a closing, but something else). 

Any unrelated adults should have to qualify on their own in order to be on the lease.  

We were downsizing, laying off grown adults that had high paying jobs, children at home and clueless.  

I have a single family house at 672 square feet and it houses 2 adults. 

The homeowner died and the children (older adults) have ownership but haven't done anything with it.

When I turned to leave the closet, there was a shoe rack with an adult toy sticking out of one of the compartments only a foot from my face.

It is best to do it while you are young because you have time on your side and can make certain life-style choices that might not be possible with a family or other "adult" commitments.

I try to cater to the adults who actually pay the rent vs the children, since children are usually the main focus during the holidays.