Just to inject some data into the conversation, see the third graph on this page http://www.electproject.org/home/voter-turnout/demographics/. It indicates that the turnout rate for the 18-29 age group is at the lowest it's been since at least 1986 (this is as far back as the charted data goes). 18-29 is also the age group with the lowest participation, relative to other age cohorts. I think the charts were made using data found here: http://www.census.gov/hhes/www/socdemo/voting/

As I've said before, politicians respond to incentives just like everyone else. Don't expect them to give a crap about you if you don't give them a reason to give a crap about you.