When do I have to stop eating junk food ?

I'm 65 now...had 3 Heart Attacks between age 40 and 42. Quit eating junk food for a while but gradually gravitated back. I ate a lot of junk food when I was working cause it was easier to grab a burger or some taco's and eat in my service truck and then get back to work. When I retired 5 years ago I ate more at home and not much junk food but I still like a good old greasy burger or my favorite junk food pizza once in a while. I'll NEVER quit eating it when I want. As far as I'm concerned quality of life means just as much to me as quantity of life.