No, but the window of gang-related violence doesn't really start until, say, 14†. Or some other age >> infancy.
So it looks like a tiny change in range when you're going from 0-17 to 0-19, but the peak of the curve already lies near the end of those ranges, so the effect is similar to comparing the range of 14-17 vs. 14-19.
† I chose this somewhat arbitrarily, but the idea is the same. The "natural" bottom of the range isn't 0, it's older.
That's true, I imagine there aren't a lot of 6 year olds doing drive-bys, but given the other major cause of death is motor vehicle accidents I'd expect that too to rise at the same age as inexperienced drivers gain independence behind the wheel for the first time.
So it looks like a tiny change in range when you're going from 0-17 to 0-19, but the peak of the curve already lies near the end of those ranges, so the effect is similar to comparing the range of 14-17 vs. 14-19.
† I chose this somewhat arbitrarily, but the idea is the same. The "natural" bottom of the range isn't 0, it's older.