How's about the following:
Andy Schleck (June 10, 1985) - 2007 Giro, 2008 and 2009 Tour BYR, eligible for 2011 white jersey
Jakub Fuglsang (March 22, 1985) - eligible for 2011 white jersey
Roman Kreuziger (May 6, 1986) - eligible for 2012 white jersey
Rigoberto Urán (January 26, 1987)
Kevin Seeldraeyers (September 12, 1986) - 2009 Giro BYR
Robert Gesink (May 31, 1986)
Bauke Mollema (November 26, 1986)
Pierre Rolland (October 10, 1986)
Simon Spilak (June 23, 1986)
- I'd consider all of these to be more likely than Sagan to win a white jersey within the next couple of years. Sagan has been a phenom for sure, but he's not stuck it out on any big mountains yet (no, Big Bear doesn't count) and has lost time there. I don't think that he could win a white jersey until his climbing improves, and also Liquigas will have other GC aims with Basso and Nibali both re-upping for the next two years, which he may well need to sacrifice his own intentions for. Plus Liquigas also have a couple of other hugely talented youngsters themselves.