Best age reversal product

To reply to your questions ( all very fundamental questions that many people do not ask, so they are not stupid):

1. Wait and watch.

2. Don't know.

3.>>Is there a particular supplement currently on the market that could significantly help retain youthfulness biologically?<<

Many supplement manufacturer claim a lot of things. But it can be difficult to verify the claims at several levels, ranging from the authenticity of the claims, to, if the supplement truly improves health and or reverses/stalls aging ( like lengthening of telomeres ). Ideally verifying a claim will require one to physically observe another person who is taking the supplement or take the supplement oneself. Both options present their own problems unless the manufacturer is offering some money back guarantee. Anyway to cut my rant short, I'm aware of no such supplement .

I don't think there is one supplement, diet, or practice that does what you want.  But there are many that provide part of what you want.  You'll have to digest a wide variety of information, and use the ones that ring true for you.

Several that ring true for me at age 74 are low fat vegan diet, nitric oxide support (Neo40, arginine, citrulline or similar action), vitamin C (3 grams liposomal per day, that much every 2 hours when challenged by sickness or pain such as dental work), vitamin D3 (10,000 IU D3 without blood tests, whatever is required to reach a blood level of 100 ng/ml with tests), zero calcium supplements, B12.  Avoid statin drugs and probably blood pressure drugs.

Don't fall for conventional medicine's claims that "proven" is better than "unproven".  "Proof" cost big bucks, while natural or off patent doesn't have anywhere near the "proof money".

You should not use any anti-aging product without a prescription. This can be harmful to you. You should consult a local physician for the same. There is nothing that can stop the aging process, what we can do is slow down the aging process. To do the same, consult a local physician and get a personalized plan for you. 

As I am from Miami, I would recommend Dr. Elliot Dinetz, one of the best functional medicine doctor in Miami. I don't know your exact location, but you can find longevity medical health center near you to get a personalized plan.

RobH said:
I prefer to buy from places that other people have had good experience with, rather than totally unknown sources

 this is also good to ask others before buying any medicine.

RobH said:
... there are many that provide part of what you want. 
Several that ring true for me at age 74 are low fat vegan diet, nitric oxide support (Neo40, arginine, citrulline or similar action), vitamin C (3 grams liposomal per day, that much every 2 hours when challenged by sickness or pain such as dental work), vitamin D3 (10,000 IU D3 ... zero calcium supplements, B12.  Avoid statin drugs and probably blood pressure drugs.

 Excellent summary.  Thank you, RobH

RobH said:
At 74, I'm not willing to wait 50 years for the doctors available to me to get a clue.  If I have to buy my antiaging products from India, Canada, or whereever, then so be it. 

At 75, I agree with @Robh about this.  And for products from foreign countries, if some turn out to be "placebos" or otherwise diluted, I'll take that chance and maybe waste a little money.  (Of course, I don't buy direct from China.)

As for me, the best age-reversal products are workouts and healthy diets. Also, skincare is a must. Add cleanser and moisturizer to your daily routine.