I’m Doing it Too!!!!
I am 90 Years old and hum songs constantly. I sing songs like Daisy Daisy, The Shadow of your Smile and Younger then Springtime, Looking through the eyes of love (Ice Castles). My daughter tries to help me break the habit by saying, Mom, You are doing it again.
I stop for a minute then I start up again. I do it when I am playing bridge with my friends, it must be annoying to them, because it is annoying to me. I wish the Medical Society would come up with an answer that doesn’t mean another pill. Good luck to all that have to live with it. I hate it too.