Here are some dietary guidelines for older people, courtesy of the Cleveland Clinic:

• Seniors should get 1- to 1.2-grams of protein each day per kilogram of their weight. For instance, a 150-pound person (70 kg) should get 70 to 100 grams of protein daily. Those with chronic kidney disease should ask their doctor about how much protein is safe.
• Seniors need 1,000 milligrams of calcium each day, and 1,000 units of vitamin D daily.
• Seniors should take special care to eat a balanced diet with plenty of fruits and vegetables.
• Seniors should take a multivitamin if their diet isn't balanced, they've been sick, or are losing weight. Vitamins don't include protein, however.