Imagine living for hundreds of years...?

Say you live to be 625, what things would you have time to do? Imagine yourself in the time where iron was barely being forged. Now, picture someone coming to you and saying that they will reward you with treasure unimaginable for more than just your simple lifetime You know this person can do this, they are most wealthy. All you have to do is change one thing about your lifestyle a year for the rest of your years teaching your new behaviors to your wife and children. Now imagine that each time you or yours strays from this way of life your future generations will age slightly quicker, thus dying younger. Each time compounding from the previous generation. Remember, it is guaranteed to your children's children's children's children ad so on that they will be wealthy beyond want. Would you take this deal?