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Benefits such as mental stimulation and social engagement are associated with staving off chronic disease.

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Punching a time clock is still part of the regular routine for an increasing number of older adults. They're staying employed or going back to work, even though they're beyond the traditional retirement age of 65.

"For well over 100 years, men had been retiring at earlier and earlier ages. Something shifted in the 1990s, and they began working longer. The story for women is different. They weren't always in the labor force. But now we see employment rates rising for women at every age," says Nicole Maestas, an associate professor of health care policy at Harvard Medical School. She studies the economics of aging, health, and disability.

These strategies may offer greater protection.

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While there's no cure for Alzheimer's disease, ongoing research has suggested there may be ways to lower your risk.

"Much of the existing science supports how certain behavioral changes made in middle age can protect people as they grow older," says Dr. Kirk Daffner, director for the Center for Brain/Mind Medicine at Harvard-affiliated Brigham and Women's Hospital. "However, there is evidence that adopting certain healthy lifestyle habits can benefit older adults too."

Sometimes the emotional part of cancer is the toughest test.

Any kind of cancer diagnosis is life-changing. There suddenly are many decisions to make about treatments, possible surgery, and recovery. It can be a lot to deal with. But one part of the cancer process that often gets pushed aside is the psychological aspect � how do you manage the many emotions that come with it?

"The natural response to hearing 'cancer' is to feel a surge of anxiety and negative thoughts like 'I'm going to die,'" says Dr. John Peteet, head of the psychosocial oncology fellowship at the Harvard-affiliated Dana-Farber Cancer Institute. "Yet many men are reluctant to admit this and keep their feelings inside, so it's tough to know when they need help with this part of a cancer diagnosis."

Engaging your brain to write your memoirs can leave a recorded history for your descendants as it helps improve your cognitive fitness.

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As we grow older, there may be a tendency to feel less relevant to the people around us. We tend to withdraw as a result, and this isolation can lead to a greater risk of depression.

But here's an idea that will help you stay in the game as it helps your family better understand their own history. It's simple: write your life story.

In the journals

So far, research has been mixed on whether brain training programs can improve or slow memory decline. Yet a new study published online Jan. 4, 2018, by the Journal of the American Geriatrics Society found that brain training may help people with mild cognitive impairment (MCI), the stage between normal brain aging and dementia.

Researchers recruited 145 adults, average age 72, who were diagnosed with MCI. They were split into three groups. Those in one group did two hours of brain training every week for two months. The training focused on improving memory by learning new strategies to better encode information. For example, they remembered errands by associating tasks with specific locations in their home, a process called method of loci. They also practiced how to better control their attention.

Research we're watching

Drinking too much alcohol could raise the risk of developing early-onset dementia, says a study published online Feb. 20, 2018, by TheÌýLancet Public Health.