What age to clip wings?

[tammayrend]

I will likely clip my girls wings - We like in a urban neighborhood and have already had one girl "fly" out of the run yesterday when I opened it to clean something out. They are 11-12 weeks old-ish and can obviously fly at low levels. So my question is, are they too old to clip their wings?

I used to work for a pet store (in high school) and after college worked for a vet, so I HAVE clipped wings, I'll admit though I'm feeling nervous about doing it and hurting the girls... How odd is that!?

I ran across an excellent photo tutorial online months ago that I'll find again too...

Thanks!