Marc Agronin (@MarcAgronin) is a geriatric psychiatrist at Miami Jewish Health and the author of “The End of Old Age: Living a Longer, More Purposeful Life” and “The Dementia Caregiver: A Guide to Caring for Someone with Alzheimer’s Disease and Other Neurocognitive Disorders.” Several years ago, my father and I visited an older cousin with … [Read more at the Wall Street Journal]