Carried a slipjoint since I was 5... now 20 and carry a Sheffield Lambsfoot slipjoint, 3" blade and one hell of a backspring on it.
Started carrying locking knives since I was 7-8... moved on to one handers in summer of 98, age 14, with a delica... now 20 and carrying 3 one handers and a fixed on me right now.
Multi tool (LM Crunch) can also be cycled one handed, and usually is.