Red. I would be a better friend, brother, son, and person. I would take care of my MH earlier, then hopefully avoid most of the hurt I allowed it to cause. Warn friends and family of fatal illness. Call those that took their life. Pass on green, even if it was $2 TRILLION.
Green button = You instantly receive $2 million (tax free).
Red button = You go back in time and restart your life at 10 years of age, with all the knowledge you have today.
You can press just once. Which do you press?