Ever since I was a kid, since I was a baby, hell - since I was an unborn fetus, I have had only one obsession. I'm not a particularly avaricious person. I don't care about my salary; I try not to eat more than one or two meals a day; I do not need to live forever, just a few millennia would satiate me.
Why can't we live forever, only dying from preventable disease or injury or other direct causes? I believe such a thing is possible.
I am in grad school for Structural Biology, so feel free to get as detailed as you want. If I don't know anything, I'll either research it on my own or ask for help finding resources.