The older guy is  statistically more likely to die then the young one so  he might also "leave" sooner.  

FNMA 10-Q Table 2: Single-Family Acquisitions Statistics sums up significantly better business practices compared to their "old book" of business from 10-Ks 5+ years ago.

Having statistics can justify single units as rental units is more practical as the MF.    

@David Faulkner yes, that's the HQ, these are national statistics.

Where did you get that statistic, if I may ask?

There are statistics on average occupancy for Section 8 occupants depending on your county but based on my memory it is like 7 or 8 years at a time on average.- You can screen them and run background checks just like any other tenant. 

Aloha,Your Agent should be able to provide you with all kinds of statistics on the local market from the MLS, including Days on Market, number of available units, list vs selling price of solds, neighborhood activity, and much more.

Heloc's written by institutional lenders ALL have call provisions... and its not to TAKE your house.. geez  where did you get that idea.The banks hire professional companies to do statistical analysis of loan portfolios and Helocs are right up there.. they look at your profession your market you current situation. and if they deem those to be risky.. they call the loans or freeze your helocs  they normally don't foreclose but they can freeze it so you can't pull any more money from it.I bailed out a lot of flippers in the recession who where half way through projects and were used to using their heloc on their personal resi as their rehab funding only to be froze out and not able to finish the project.. and of course they had a big money first usually that was ticking away...

I wish we could see statistics on how many of rhe people lost their shirts trying to rent other peoples houses.

Seeing you as a statistic would be a tragedy.