As one poster noted, many adults are just "big children".  

I feel like millennials will start shying always from ‘hype fads’ to create a more humble teenager to adult

If you are dealing with full grown adults or a family and they show a history of short-term stays like a year less and then move.

Only to be interrupted by a GC and realize I'll have to micro-manage adult 'professionals' while on 'vacation' or turn around, get in my stretchy shorts and go out to the site.  

The city inspector that went to check the property for marijuana that of course was removed, also asked me if the tenants were running an adult care business from home as he had witnessed elderly people come in and out of the house in multiple occasions.

According to a recent survey by the Detroit Chamber of Commerce, metro Detroit had the second-highest growth among comparable cities for adults aged 24 to 35 over the preceding decade and ranked second overall among peer cities..When it comes to residential real estate in Detroit, prices are quite cheap.

We are all adults here and if people do not have anything helpful to contribute to a discussion, why even reply? 

So if I have a single family of 3 adults wanting to rent the house, do they all need to apply separate and pay the application fee?

The troublemakers could try to take an inheritance from a special needs kid/adult. 

There are many sports programs out there for youth and adult athletics that could act as long term tenants which would be great in ensuring people actually care about the place and that it produces income.