Re: Age requirement?
Age? Not sure, under 21's have been down though, so don't give up.
When to apply? You have to keep looking at the Raytheon site, they update when they are ready. They have far more applicants than posts so do as they please and don't bother to email and let people know. It's anytime now but can vary by weeks from year to year.
If you go to a job fair it helps enormously and if you don't get the first job you go for, keep on trying, tenacity works.