It could be a RIR or sex-link of some sort. It's a bit of a gamble as far as age goes, you could look at her skin and comb, eye color, etc. Usually the older birds look a little more "washed out" with paler skin and a little less robust colored comb.
On of them escaped this morning and is now gone. And my lovely neighbor though it would be best while me and dbf tried to capture them to hurry up and drive there little off road vehicle up and down by my house to scare her off completely. They were new birds I had just gotten and I only managed to capture 3 of the 4.