It is the position of the Academy of Nutrition and Dietetics that appropriately planned vegetarian, including vegan, diets are healthful, nutritionally adequate, and may provide health benefits in the prevention and treatment of certain diseases. These diets are appropriate for all stages of the life cycle, including pregnancy, lactation, infancy, childhood, adolescence, older adulthood, and for athletes.
For helpful tips on healthy aging as a vegan, please see Dr. Michael Greger's recommendations for healthy aging, and preventing, treating, and reversing Alzheimer's and cognitive decline.