I remember hearing way long ago that teenagers accounted for half of all disfellowshippings. It was explained that they were more sexually active and less experienced at hiding it. Even though there are fewer young ones nowadays there might be more disfellowshippings of older ones for apostasy. What goes on above the waistline is what worries them the most.
I wonder if disfellowshippings are still 1% per year.