16 and 17 years old.
Three teens arrested in armed home invasion of Cleveland Orchestra violinist
ETA: These were caught relatively quickly, but I'd bet my farm on the fact that if I looked more than a few minutes, I could find cases of teens committing home invasions where they we captured long after the actual crime.
I'd bet that a very small percentage of them got away with it for very long. Especially once the FBI is involved. Not to mention the kidnapping angle. 16/17 year olds just don't generally have the mental capacity to participate in a double murder/abduction and keep their mouths shut about it. Has there ever been a murder/abduction perpetrated by teenagers where they got away with it for a significant period of time? Feels like quite a reach