Its not aging, its a slight glitch that happens , you must have went through some kind of stressfull or traumatic event before/during when it came...just start to observe yourself there are few things that you must be doing. 1.Pushing hard (with lips, tongue, or throat) 2.Stopping phonation (when anxiety hits, anticipatory fear hits and you go into a little brain fog/fear) 3.Stopping breathing as well 4.Not initiating articulation/breathing/phonation when anticipatory fear kicks in.