As Glenn at Instapundit says...Faster please!
I had a discussion with this on another site, and I said “So, if everyone doesn’t age, it would mean you’ll never want or need to retire from your job. Which means that young people will have a hard time finding work.”
And someone suggested to me (with a touch of humor) that “They should just give Social Security checks to everyone when they turn 18. You then live on the public dole for 100 years until your elders die at 300 and you get their job.”