The path to a significantly extended lifespan starts from education. That means biochemistry, nutrition, anatomy, etc… These are indeed hard, time consuming, and frustrating, but with effort you should have a good idea of at least the foundations of the proper lifestyle within months. These months will be generously repaid with indefinite years down the line, so it is well worth the time to study.
Here is a list of some herbs/botanicals that have been associated with increased lifespan. Please help me add to the list if you are aware other herbs that I have not listed...