While the predictions of futurists can be a bit hit-or-miss (hence the cry "Where's my flying car?!"), some end up being pretty close. Ray Kurzweil has a good enough track record for the National Academy of Engineering to publish his sunny forecast for solar energy, and I'm certainly hoping his most recent round of predictions, discussed in this recent New York Times article, is as accurate as his 1989 prediction that by 1998 a computer would beat a World Chess Champion (since IBM's Deep Blue defeated Garry Kasparov 1997).
Ray has predicted, among other things, that in another 15 years, human life expectancy will rise each year faster than we age. That sounds to me that as long as I don't manage to get myself killed in the meantime, I can be 45 forever — which doesn't sound terribly bad, actually. (Of course, the other alternative to continue growing older but never dying, until we're all nothing but shriveled, wrinkly things with no hair except what grows out of our huge ears and noses, which is a somewhat less attractive proposition...) Ray also predicts a technological Singularity sometime in the middle of this century — which any fan of Charles Stross, Vernor Vinge, Iain M. Banks, or Dan Simmons knows sounds pretty sweet.