He's actually younger than some of them.
These are the Juventus Under-23 players who got some playing time this season:
Vrioni (October 1998) 22 years 3 months
Rafia (April 1999) 21 years 9 months
Frabotta (June 1999) 21 years 7 months
Di Pardo (July 1999) 21 years 6 months
Wesley (March 2000) 20 years 10 months
Kulusevski (April 2000) 20 years 9 months
Portanova (June 2000) 20 years 7 months
Fagioli (February 2001) 19 years 11 months
Dragusin (February 2002) 18 years 11 months
De Graca (May 2002) 18 years 8 months