Investigate your family medical history. Talk with older relatives who can tell you, in the course of their stories, what kinds of medical risk factors you might have inherited.
Take a photo with your phone that shows exactly where you parked at a mall (or a concert, the airport, etc.). Then you'll know exactly where your car is several hours (or days) later.
Avoid interfering in your adult children's lives, but be present and supportive when they need you. If they ask for advice, provide it. If they don't, keep quiet. This is their journey, and one day you won't be there to take it with them, so help them grow into their own path.
Cherish your life experiences. Older adults remember a time before constant connection, when children played in the neighborhood until dark, and life was far less hectic than it is for younger people today. Preserve those memories by writing them down.
As retirement nears, divide financial assets so that no more than half are in stocks in general and no more than five to 10 percent are in the stock of your employer (if applicable). This ensures you can weather market fluctuations with minimal impact.