Depending on local laws, send renewal notices in advance of the end dates, specifying a requirement for an in-person meeting with all adult occupants by a certain date; provide them your application form to be completed and returned to you prior to this meeting so you can approve them; and advise them of the terms you will offer if they are approved.

I treat my tenants as adults.  

I'm not that much older, and have very strong FICO Scores (760's) but.. from my research, haven't really seen banks excited to lend to young adults.

Sometimes the adult kids stash their parents there.

Because families tend to rent big units so it makes them less risky compared to single adults that may ruin and not take good care of their living space2.

My thinking is that four adults will cost a lot more in utilities, but I’m not sure if raising rent is something commonly practiced when there are extra tenants.

He was 18 (adult) and got his 15 year old girlfriend pregnant.

Little did you know you were in the (adult) film studio business. 

This gives us the luxury of time for the screening of tenants and also the ability to help our children start their adult lives a little easier than we had it.  

Plus after speaking with her today I found out that after learning how much equity she has on her house 2 of her kids (both young uneducated adults 23/25 ) are fighting to sell the house and trying to take her profits lol.