Man it is my one of the favourite questions to ask now a days. I have never received the right answer so far and I don't think there would be any right answer to it but yeah some of them have been interesting.
*Live in the country side

• Live happily, try to avoid regrets and saddnes in life
• Meet and greet as much people as you can.
• Eat healthy food including green leafs and it is better if they are home grown as you mentioned.

I heard google was working on it on how can we replicate our cells without damaging them which will result in the stop of aging process.