He is 19 yrs old on both itfjuniors.com and juniortennis.com these two sites, but atp listed him as 16 yrs old.
He had quite good results when he was juniors. Winning RG 2002 doubles and being #1 in doubles was his best juniors result.
his profile at itfjuniors
http://www.itfjuniors.com/scripts/bios/bio.asp?ID=30020620
and he did play Nadal once last year at Wimbledon juniors, Nadal beat him in three sets.
Philipp PETZSCHNER (GER) v Rafael NADAL (ESP)
2002 GA The Junior Championships, Wimbledon Grass (O) QF Rafael NADAL 6-2 3-6 4-6
Rafael NADAL (ESP) leads 1 : 0
Go Philipp
