When do I have to stop eating junk food ?

they call that fast food junk "heartbombs"!!! and for a reason!!! LOL i beleive food is a HABIT where it be eating too much or the wrong foods.
they say a combo of exercise and right foods is what matters. i/m 66 and have lost several of best friends in their 50's and it wasn't due to the BurgerKIng either.
honor your good health as long as you can, as you get older you WILL wear out!! me personally, i did the things in life i wanted to do while i was young enough and didn't have the plan to wait till i retired to do them, knowing fool well when you retire you are probably too old and tired to do them, now i just can't afford them!! LOL