You may have also noticed losing weight has become more difficult compared to when you were younger. This is true for everyone, even your skinniest friends. And it isn't because you've changed, and now you're eating too much and exercising too little. In fact, many of us are eating less and exercising more than ever before. What this does mean is that the standard medical intervention to "modify our lifestyle" doesn't work once we begin aging, and even when it does, the weight loss you'll achieve is incredibly hard to sustain.