I hate when people bring up average life expectancy statistics. Those statistics are not figured independent of infant mortality rates. 200 years ago, if you live to be 12, you were very likely to live to be 65, which is not substantially shorter than today's standards. The other thing is quality of life. Yeah, people are living longer but their quality of life is still typically very bad in the later years. We have people who spend 15 years in an old folks home rather than 3 or 5. If you can't live independently then you might as well start euthanizing people, or at least me when I get up there.
That said, I find the funniest part of science fiction is always the concept that you get bored a lot. That concept is pretty ridiculous because I don't ever get bored really. There is always something to do. An eternity where you didn't have to worry about aging or your body breaking down is a pretty great idea to me and probably most people.