The annual number of alcohol-related deaths from 2020 through 2021 exceeded 178,000, according to recently released data from the Centers for Disease Control and Prevention: more deaths than from all drug overdoses combined.

An analysis by the National Institute on Alcohol Abuse and Alcoholism shows that people over 65 accounted for 38 percent of that total. From 1999 to 2020, the 237 percent increase in alcohol-related deaths among those over age 55 was higher than for any age group except 25- to 34-year-olds.

Americans largely fail to recognize the dangers of alcohol, said George Koob, the director of the institute. “Alcohol is a social lubricant when used within the guidelines, but I don’t think they realize that as the dose increases it becomes a toxin,” he said. “And the older population is even less likely to recognize that.”

The growing number of older people accounts for much of the increase in deaths, Dr. Koob said. An aging population foreshadows a continuing emergence that has health care providers and elder advocates worried, even if older people’s drinking behavior doesn’t change.

But it has been changing. The proportions of people over 65 who report using alcohol in the last year (about 56 percent) and the last month (about 43 percent) are lower than for all other groups of adults. But older drinkers are markedly more likely to do it frequently, on 20 or more days a month, than younger ones.

Furthermore, a 2018 meta-analysis found that binge drinking (defined as four or more drinks on a single occasion for women, five or more for men) had climbed nearly 40 percent among older Americans over the past 10 to 15 years.

What’s going on here?

The pandemic has clearly played a role. The C.D.C. reported that deaths attributable directly to alcohol use, emergency room visits associated with alcohol, and alcohol sales per capita all rose from 2019 to 2020, as Covid arrived and restrictions took hold.

“A lot of stressors impacted us: the isolation, the worries about getting sick,” Dr. Koob said. “They point to people drinking more to cope with that stress.”

Researchers also cite a cohort effect. Compared to those before and after them, “the boomers are a substance-using generation,” said Keith Humphreys, a psychologist and addiction researcher at Stanford. And they’re not abandoning their youthful behavior, he said.

Studies show a narrowing gender divide, too. “Women have been the drivers of change in this age group,” Dr. Humphreys said.

From 1997 to 2014, drinking rose an average of 0.7 percent a year for men over 60, while their binge drinking remained stable. Among older women, drinking climbed by 1.6 percent annually, with binge drinking up 3.7 percent.

“Contrary to stereotypes, upper-middle-class, educated people have higher rates of drinking,” Dr. Humphreys explained. In recent decades, as women grew more educated, they entered workplaces where drinking was normative; they also had more disposable income. “The women retiring now are more likely to drink than their mothers and grandmothers,” he said.