Life and Death decision
This may seem silly, but trust me, I'm going somewhere with this!
If alliens came to earth and offered everyone who wants to accept, a life span of 200 years + plenty of money + a good life + healthy body and brain of a 30 year old + your friends and family could join you.
But the aliens want one thing. After 200 years of a great life, you die a peaceful and painless death. They ship your body back to their home planet where you are eaten.
This is not a deal-with-the devil with hidden consequences or anything like that. It is just what it says.