Goalkeeper is the one position where I'm not sure that is a positive thing. Experience is far more important, and I'm fairly sure that most goalkeepers would say they are at their peak in their early 30s.
Boruc is 27, so theoretically has ten years left at the top, and we'd be getting him just as he hits his best.
Still, who knows. Unless something amazing happens, I'm happy with Sorensen for the moment.