Some people can't be told anything, regardless of age, only a fool doesn't recognize good advice.

I am really just getting started on the business journey of buying and holding rentals for passive income at the ripe age of 24..

I could put in the age of the mechanicals in each property, along with their life expectancy, to get a better handle on how much I should be putting away each month for capex.  

How does hot water heater look/age?

House size, age, lot size etc are also knobs you can turn. 

It sounds like you are on the right path, and at an early age.  

Well, those who have reached the age of 18 are considered adults, aren't they?"

It varies slightly around Atlanta but usually you just need one electrical permit to be pulled to get the county to inspect.BUT....Depending on the condition of the interior electrical, age / brand of the panel "Federal Pacific is pretty much a given you will have to update the panel, ect the county / city may require you to UPDATE those things before passing the inspection, which could run several hundred to several THOUSAND dollars depending on what needs to be done.Is this a cosmetic rehab or do you need to pull a building permit anyways that this could just go along with?

The tenant age is in their 70s.How do i handle the tenant's complain ?

Anything to watch out for in the inspection given the age or configuration?