As an older male you may want to consult your doctor about any specific dietary needs, and I suggest a physical to find out if you have problems like high cholesterol, etc, but I'll talk to you about it in general terms.
A point of
fat is about 3500
Calories (kcal). To lose a
pound a week you'll need to cut your
diet by 250
calories and burn 250
calories through exercise/activity every day, 500 each for two
pounds a week. If you're actively gaining weight you may need to cut your
diet further although doctors recommend not going below around 1400
calories a day.
Now when you reduce the amount of food in your
diet, you want to maximize it's impact on your
body. Up the amount of vegetables you're eating and look for lean sources of protein like skinless chicken and fish. Switch to eating whole grains such as bran, oatmeal, whole grain bread, and popcorn for example. Not only are whole grain products packed with more nutrients, the fiber they contain will make you feel fuller for longer.
MyPyramid.gov - United States Department of Agriculture - Home is a great site and you can even sign up there and enter a food diary that will break down the nutrients and
calories in each of the foods you eat so you can get a much better idea of your
diet habits and adjust accordingly. There's also information on portion sizes as well.
Eating more slowly and drinking water will also curb your
hunger. For a person your size, it wouldn't be crazy to suggest at least 12 to 15 8-oz cups of water throughout the day, and more so on the days you exercise. Proper water intake will also facilitate the metabolism of
body fat.
I hope thats enough info to point you in the right direction, good luck!