1) We eat chickens. Worms eat us. Chickens eat worms. Simple enough for you?
2) Increased lifespan and to 'cure' age. Very different. You understand what consumption means, so I wont insult your intelligence further by taking this question seriously. We play god enough already, humans make mistakes often.
3) I totaly despise your theory that age is something that needs a cure. Like AIDs or Cancer.
4) Being alive is selfish. Unless you are motionless all day and kept alive by someone else, your every instinct and need is first and formost about maintaining the self in body and mind. Otherwise 'life' would not have happened at all. Multiply how much you have consumed, and how self contained you become when you see 500 years in the same body and mind? Or more?
5) There you go again. Two words. 'Cure' and 'Age' as if it is a perfectly natural idea. Age is to be embraced, treasured, fought against and then finally given in to total peace and death.
6) Who was the last person you loved deeply that suffered some way? I know it was not you, but maybe something can help you grasp what others live with every day.
Failing anything in your life that is full of pain and grief.....how about if someone attacks you tomorrow for your wallet and rips your face off. Burns you, punctures your eyes, burst your ear drums and breaks all your limbs. That is extreme of course, but worse things have happened to people and they survive.
Sure you could patch yourself up and make the best of it for the next 450 years. Maybe you are that strong. I am not.
I already answered it with a demand for clarification on your math which you "ignored".
I can imagine you having a very succesfull love life when you start using calculus to decide if you love someone or not. Maths is as pointless as time when it comes to the soul. You just would not understand.