here is a good example at age 20 in giro regioni 
Uitslag:
1 Tony Martin (Ger) German National Team 3.03.32
2 Filipe Gomes Sa' Rui (Por) Portuguese National Team 0.11
3 Robert Gesink (Ned) Dutch National Team 0.22
4 Riccardo Ricco' (Ita) Italian National Team 0.23
5 Roman Kreuziger (Cze) Czech Republic National Team
6 Alexandre Cabrera (Fra) French National Team
7 Eduardo Gonzalo Ramirez (Spa) Spanish National Team
8 Peter Velits (Svk) Slovakian National Team
9 Luigi Sestili (Ita) Italian National Team
10 Peeter Jacobs (Bel) Amuzza.Com - Davo
11 Simon Clarke (Aus) Australian National Team 0.27
12 Andrei Kunitski (Blr) Belarus National Team
13 Jaroslaw Dabrowski (Pol) Polish National Team
14 Michael Muck (Ger) German National Team 0.30
15 Marino J.Marc (Fra) French National Team 
in fact most of his u23 wins came from climbing stages and not itt's. he was 2nd german climbing championships elite at age 20, won thueringer rundfahrt, 2nd in tour de avenir and at age 19 he won this climbing itt in regio tour:
1 Tony Martin (Ger) Gerolsteiner 33.43
2 Maxime Monfort (Bel) Landbouwkrediet-Colnago 0.09
3 Matthias Russ (Ger) Gerolsteiner 0.21
4 Nico Sijmens (Bel) Landbouwkrediet-Colnago 0.43
5 Björn Papstein (Ger) Team Lamonta 0.44
6 Rinaldo Nocentini (Ita) Acqua & Sapone-Adria Mobil 1.02
7 Holger Sievers (Ger) Team Lamonta 1.05
8 Gerhard Trampusch (Aut) Akud Arnolds Sicherheit 1.08
9 Sergey Yakovlev (Kaz) T-Mobile Team 1.23
10 Moises Aldape C. (Mex) Ceramica Panaria-Navigare 1.28