I'll be bringing my new girls home tomorrow. They are both 1 1/2 years old and live together right now, but I will be introducing them to my crew of 5 in the near future. My crews ages range from 6months to 2 1/2 years. I've only ever done intros with young ratties and its been successful but I'm starting to get nervous about the intros with my older rats. Are intros with older rats a lot harder? I know it has a lot to do with each rats individual personality but I have a feeling that its going to be a lot harder with them being older and all...Any advice would be much appreciated. Also any stories about bad intros would help as I want to be prepared for the worst.