I don't know about intentionally not feeding youngsters as a good practice, but I could see it being something people do... I do feed some of my breeder males less often sometimes. Or I feed them a small meal once a week just to keep them working for me.
As for what size, the percent isn't always a great measurement. Really you can get away with eyeballing it. You want to feed a prey item that is just slightly thicker than the thickest part of your snake. If you aren't comfortable with that, pick something the same thickness as your snake. You want to see a bit of a bump in the snake, if you don't see a bump, feed a little larger next time. Large females may not have a noticeable lump, keep that in mind.
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