The problem is how we understand the word anti-aging, or rather, how those in the business sell it.
Making feel and looking young by taking drugs is not the same as reducing your metabolism, and therefore your vitality and energy, to extend your years of life.
If you have an old car and you make some improvements to it, better oil, nitrous oxide, it may run faster, but the car is still old and it won't last long before it collapses.
Now, if you have an old car and you want to extend its life, you will use it as little as possible, and when you use it, you will not squeeze it as if it were new car.