Another place to check is on yahoogroups which has a northern UT poultry group.
I saved some hens from the stewpot early last winter. He was rebuilding his coop and didn't want these because they were molting. I asked him how old and he said that they were no more than 18 months, that summer 2008 would be their 2nd year of production.
Inspite of being in heavy molt they provided us with the eggs we needed to fill our orders all winter long until our own chickens started laying again. I suspect that one or two of them are older than he said but the others do look about the same age as our layers.
I paid $3 each for them (there are 10) and would like to get that back to buy more feed.
I only have some silkie cross roosters left - but I'll answer your email you sent me today and we'll talk more about what's what.