Is this an official government classification I can find somewhere or Bigger Pockets measure I need to learn?

I'm writing this in hopes that other's will take control of their future and dreams instead of letting their past or what's "normal" govern their lives.Like many others, I went to college in hopes of a better future.

I suggest speaking with a local attorney that would know the specific laws that would govern this. 

In theory, your question makes sense, but the government has lots of rules.

The AU government is about to change the rules on being able to claim the main residence exemption if you are considered a foreign resident. 

Ridiculous government requirements. 

I heard you can get government benefits/credits for fixing up a historic house.

AirBNB does not allow you to set a minimum age BUT - in their "you have an inquiry" email they'll tell you if the person is over/under 25 (right next to saying they have verified government ID).  

As I mentioned before, it's all about personal preference, so that should be your (and other's) foundational guide.One anecdote: The most successful real estate investor I know, personally, invests in a great number of government and university treasuries. 

Purchase price: $150,000 Cash invested: $80,000 Single Family Home in a nice area (Close to DC, in MD; Blue Collar & Government Workers).