In order of how much they get ridden:
1) On One Pomepetamine, parts are anything from 1-4 years old, commuter.
2) 1993 Cinder Cone, kiddie hauler, pub bike.
3) 2011 ASR5, oldest part are the wheels (2009), newest is fork (2013). MTB
4) 2008 Storck Scenario. Race bike which sadly sees almost no use these days.