I feel old now but I played Halo from when the 1st one came out and I was 24, stopped playing at Halo 3, not because of online but struggled with campaign, didn't really play online in them days, and I have just come back, with Halo Reach, but started playing ODST recently and couldn't belive what missed out on, but there are still the dedicated fans and you can still have some good games.
Sorry for rambeling on
[Edited on 11.02.2010 9:00 PM PDT]