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http://www.feathersite.com/Poultry/CGP/Sebr/BRKSebrights.html Look at the difference between the male and female. First picture does indeed look like five males and two females. Have they been laying? That will help tell if their age. If not then take a picture of their displayed wing and post it. Depending on how many "short" feathers are left that can help with age guesses too.

You have 5 cockerels in the first pic. Sebright hens do get combs and wattles, they start out black and get a little pink in them as they get older.
The second picture looks like 2 pullets and a cockerel on the right.
I'm not sure on the ages of the ones in the first pic, they look like adults though. The ones in the second pic are probably 6-8 weeks.