I am not big on top ten lists, but your list has me wanting to suggest other great titles within either the themes or directors you have covered:

The young people theme:

French films:
L'Argent de Pouche --1976-- another Truffault film
Jeux interdits --1952-- Rene Clement
Les Dimanches de ville d'Avray --1962-- Serge Bourguignon
Italian films:
I Bambini ci guardano --1942--  Vittorio De Sica 
Nuovo cinema Paradiso --1988-- Giuseppe Tornatore 
Greek films:
Topio stin omichli --1988-- Theo Angelopoulos    
Eastern European films:
Dom za vesanje --1989-- Emir Kusturica
Idi i smotri --1985-- Elim Klimov

Other Fellini films:
8 1/2

Other Tarkovsky films:
Solaris
Stalker
The Sacrifice

Other Kieslowski films:
The Decalogue

Enjoy.

JOhnN