aquamarine and peridot :)
aquamarine- do you believe that the future is predetermined?: uhh yes and no; i don't really believe (or want to believe) in a supernatural entity or higher power or deity deciding our individual futures before we even get a chance to see what's what
but i also am a strong believer in the power of patterns and coincidence; so like on the grand scheme of things (i'm talking like the entire universe and whatever exists outside it if anything) the path that existence is going to take has kind of already been determined by physics and probability and etc since the instant of the universe's conception which is kind of cool if you're into that i guess
peridot- how old do you want to live to?: i've already answered this once but since it's my birthstone i'll answer it again w/ a slightly different answer
i want to live to be as old as is necessary for a still-living thing to become a god
but not so old that i am the last sentient thing left
which if you think about it is kind of the fate of a god it must be lonely