Hi everyone! A few years ago I read a fantastic short SF story online, and now cant seem to find it back. Can you help me? The story start out with a teen in high school (maybe college) who asks his teacher what the point in life is. The secrets to longevity are then discovered and the story describes his life over billions of years (with all the various shapes he took on over that period) and ends with him watching the end of the universe together with his wife (who was his high school sweetheart, although they didn't always stay together through the billions of years), who asks him if it was all worth it, and he answers in the affirmative. TIA!