i floss regularly now since my dentist scared the crap out of me by describing how your immune system goes to hell as you get older and your mouth can't fight bacteria like it used to, resulting in cavities, of course. i'm now acutely aware of my age, and really want to keep my teeth until the day i die and no longer need them, so i floss every night.
oh, and i'm a sucker for praise from my dentist when i get good "scores" on my gums (the depth of the pockets between my teeth) during my check-ups. it's a weird little game i have to get better results every time i go. 🙄