I face the same challenges. A lifetime of eating habits is hard to overcome.
When it comes to giving up "bad stuff", I try to take a moment and ask, "Do I really, really want this? Or is there a better choice?"
But when I'm hurried or stressed, it's just too easy to fall into an old pattern.
Even small changes add up over time. I've made a lot of dietary changes -- more vegetables/salads, less meat, way less sugar, less alcohol, etc. But it has taken years. And sometimes, I just gotta have the ice cream! It's a slippery slope.
What sort of changes are you looking to make?
'Making the better choice" is how I approach eating. Life is too short to not enjoy food. I stick to a general plan (I favor a Mediterranean diet) and try not to obsess with getting it right--80% is good enough. It is important for seniors to get enough protein; experts suggest about 1.2 gram of protein per kilogram of body weight (1 kg = 2.2 lbs).