The IT team at the big facility (our 'parent' facility) up in the city is reasonably big and split into subteams: Operations, Applications and Infrastructure - there may be a fourth but I'm not sure.
So, there's a range from 50+ down to about 25 ish.
In the smaller facility that I'm based at, there isn't really an IT guy. I guess i'm the defacto support guy and I'm 40. I only do really trivial stuff though, anything significant gets passed on to the proper IT team.