Losin' it in the 70's

Hi all,
I'm now 70 and am ready to make SERIOUS changes in my eating/exercise habits. My Dr. recommended MyFitnessPal during my checkup last Thursday. She has a patient who lost 200+ Lbs. and thought I might be interested. My first full day was yesterday & so far, so good--I've lost a pound...WOOHOO!
As the saying goes, a "journey... begins with one step"...well, my weight loss journey begins with one pound! Would love to hear from others in my age group for tips & encouragement. Here's to healthful weight loss!!