yes there are three or four hockey clubs in Zurich.
Grass Hoppers (my boys play for them)
www.gc-landhockey.ch
Red Sox -
www.redsox.ch
Zurichsee -
www.zsht.ch
and a bit futther out
Wettingen -
www.rww.ch
All of the clubs have several age groups, and a 10 year old would play for the under 12s. CH has different playing age groups to the rest - not sure why.
Wettingen is by far the best and most professional club but it depends what you're looking for in a club. i can speak about GC and the pros and cons.
PM me if you want more info