That's terrific.... I'm 1.5 pounds away from the same goal, but this is it for me. I last weighed this much in 1992. It takes determination and willpower - also to keep it from coming back. Good on you!!!
I use an app called Lose It! (apple and Android) that helps me count calories. By counting calories, and cutting out all excess sugar I had little problem losing weight.
Way to go! 50 lbs is a serious load off your back! Keep it up!
By the way, I was just reading an article yesterday about a study specifically on weight gain/weight loss in people over 50 that said the body metabolizes proteins better throughout the day when they are introduced early in the day's first meal. In other words, folks that eat just cereal and fruit in the morning make it harder to metabolize proteins in the afternoon/evening, and that the inclusion of something like a hard boiled egg every morning with their breakfast actually is better for weight loss as long as you stick to portion control for the following meals.