She's very low key, down to earth, and extremely active in the community, even in her advanced age.  

My wife and I both have really great jobs (for your age, I suppose).

The basics are much broader than most adults are exposed to in life at child rearing ages.

For example, for tax year 2015 the owner-owner employee can contribute as much as $53,000, and, if  are age 50 or older, an additional $6,000  for a total of $59,000. 

I learned from my parents and grand parents at a young age, about real estate and mail box money.

Well in the technology age its nearly impossible to do this now, however before computers and the internet people did this all the time I hear from older investors. pretty crazy but hey you gotta learn to play the game!

First, congratulations on having goals and good financial sense at a young age.

The so-called 2% rule is a different benchmark of the same metric.It does not provide any useful information about the quality of the asset: how much of that gross revenue is consumed by operating costs; what is the age and condition of the asset (is it functionally obsolete); etc.?

My only worry is the age of the home (1820) but it does look well-maintained. 

I'm 47 years old and I've got a government pension coming, but I've also got a military retirement when I reach age 60.