Newbie wondering about age

[Egg]

I got 3 buff orp's and 2 americaunas yesterday (they are probably easter eggers, actually) from a nearby farmer. I'm so happy with them and asked a million questions, but the one question i failed to ask if maybe the most important one: how old are they? he said to keep them at a temp of at least 80 degrees, but they seem a little young to me. are they any pictures of chick's progress week by week? i've done a search but nothing--i know there has to be something like that with all the great info, but just not searching the right terms.
any ideas?
thanks all! you've already been a great support to us as we embark on raising chickens!!

 

[rooster0209]

Have they started feathering out?

I have some that are almost 3wks and they are beginning that "ugly" stage of still fluff but feathers are coming. They are in and out of the brooder at will.

Post a pic or search. I have seen some chick pics posted in breed/sex guesses where they tell the age.