I joined BG as a trainee when I was 24. I wasn't the oldest in the group either. As Agile says, if you stick in and listen to the training officers the engineering academy is a fantastic place. Just dont get turned to the dark side when you go out on the patch. By that I mean unneccesary sales and bumping tough jobs onto fellow engineers. Unfortunately this goes on, but the vast majority of guys are very good engineers. Go for it.