H.D.
I think this is normal weird :) I am 27 years old and still have a hard time keeping my fingers out of my mouth. My mom battled me with this as long as I can remember. She put finger nail polish remover on my fingers so it would taste bad but nothing worked. I even have a tendency to pick at the sides of my fingers to the point I make them bleed or sore. I know it's a gross habit but alot of the time I don't even know I'm doing it until my husband or mom tells me to stop. I think it's a brought on by anxiety for me. Bare with him. He night grow out of it.