I'm not going to read the article, because I don't care enough to know about the biochemical mechanics at the moment, but it doesn't sound unreasonable to expect that medical science will continue to find new ways to extend the average lifespan, and quality of life, relatively speaking.
Whether or not this treatment will help in that, I don't know.
Early 20s. Also go to college just 4 fun and with no credits or exams, and preferably for free. Listen to cool-sounding math shit, look at girls' behinds, flex your Linux skills