Just as you may not run as fast or jump as high as you did as a teenager,your brain’s cognitive power—that is, your ability to learn, remember, and solve problems—slows down with age. You may find it harder to summon once familiar facts or divide your attention among two or more activities or sources of information. These changes affect your ability to focus, so you may find yourself getting more easily distracted than you were when you were younger. Hearing loss that often accompanies aging makes it more difficult to distinguish speech in a noisy environment. Because hearing then requires more concentration than usual, even mild loss of the ability to focus can affect speech comprehension.