If we can "normalize" those hormon as our body can't produce it anymore, by means of injection from external medication, when our hormone is high-normal like 25 years old, then we become 25 years old again inside physically.Actually many folks think I'm still 32-34 haha LOL LOL, the recipe is just all above comments + HRT that really works well for me.

I recommend you never sell a property unless you have a firm plan to invest the money in something that produces a better return or moves you closer to your goals.

RE is unlikely to produce similar return to that great decade for RE investors.  

One day you’ll tap into the equity and use it to purchase more income producing assets.

When I get to PA taxes, I see the deferred gain in Schedule D of PA-40 which is recognizable and producing a tax liability.

If you're open to out-of-state investing and looking for an inexpensive market that produces strong cash flow, I recommend checking out Cleveland, OH. 

SCENARIO: You quit your W-2, but you have $100,000 in cash and five single-family homes that produce $75,000 in cash flow and have $400,000 in equity. 

On the flip side, the large models did not cost that much more to produce, but the market would pay much more for a 10,000lbs top model. 

Exchange your non income producing property into an income producing property.

Also, come resale time, the duplex would have a proven track record of producing income and has definable value, whereas a single family home is largely dependent on current market conditions and home buyer emotions and buyer pool at that given time