Old age begins in the mid-60s and lasts until the end of life. Most people over 65 have retired from work, freeing up their time for hobbies, grandchildren, and other interests. Stamina, strength, reflex time, and the senses all decline during old age, and the number of brain cells decreases as well. The immune system becomes less efficient, increasing the risk of serious illnesses such as cancer and pneumonia. Diseases such as Alzheimer’s disease that cause loss of mental function also become more common.
Bob and Elaine are neighbors. Elaine goes for a five mile run every morning before work. She hasn't been sick in years and is proud to be healthy and physically fit. Bob retired last year. He is not as active as he used to be but he takes advantage of his extra free time to build cabinets and other furniture, something he has always enjoyed doing.
Who is younger?