SUITLAND, MD—According to alarming new figures released Monday by the U.S. Census Bureau, the nation's population of mature adults has been pushed to the brink of extinction, with only 104 grown-ups remaining in the country today.

One of the last remaining grown-ups in the United States.

The endangered demographic, which is projected to die out completely by 2060, is reportedly distinguished from other groups by numerous unique traits, including foresight, rationality, understanding of how to obtain and pay for a mortgage, personal responsibility, and the ability to enter a store without immediately purchasing whatever items they see and desire.

"Our grown-ups are disappearing at a much faster rate than we previously believed," said Census Bureau chief Robert M. Groves, who believes the decline in responsible adults may now be irreversible. "Unfortunately, we've only recently noticed this terrible trend, perhaps because of this group's unusual capacity to endure hardships with quiet dignity instead of whining loudly to draw attention to themselves."

"If nothing is done, these wondrous individuals, with their special ability to consider the long-term consequences of their own behavior and act accordingly, will be wiped-out completely," Groves added.

According to recent data, the grown-up population has plummeted dramatically since 1950, when a Census count found that more than 24 million Americans could both admit when they were wrong and respect a viewpoint other than their own. Today, only one in three million citizens can provide thoughtful advice to a fellow human being instead of immediately shifting the topic to their own personal issues or what they had for lunch.

Experts confirmed the mass extinction of grown-ups has coincided with the rapid expansion of other demographic groups, including people who seek medication for every problem they encounter, 33-year-olds who participate in organized kickball leagues, personal injury litigants, and parents who try to become friends with their own children.

"Grown-ups are as fascinating as they are rare," said anthropologist Arthur Ambler, who has lived among level-headed adult populations and documented their lifestyle. "It may seem odd to the rest of us, but for mature adults, occasionally putting the greater good ahead of their own interests or remaining calm when something doesn't go their way is commonplace."

"Imagine confronting a problem directly instead of pointing a finger, cowering in fear, or pretending it just isn't happening," Ambler added. "This is how these people actually live, if you can believe that."

Many social scientists, including Ambler, have called for a complete record to be made of the declining population's customs, worrying that knowledge of how to dress for a job interview or when to rotate one's tires could soon be lost to civilization forever. Future generations, they soberly note, will likely go their whole lives never knowing a grown-up person.

When contacted for comment, Colorado resident Ray Vogel, a grown-up, told reporters he was resigned to his group's fate.

"We recognize that our time has come and gone, and we're prepared to let nature run its course," said the 54-year-old, who has a well-funded 401(k) and has never taken out a high-interest loan to purchase a Jet Ski. "I'm just grateful my two children didn't turn out patient and considerate like me. They'd never be able to get anywhere in today's world."

According to Vogel, the nation's remaining grown-ups have drafted a letter to be read by the rest of us when they are gone that implores us to make "good decisions" in their absence and explains how to reignite the pilot light on the hot-water heater should it go out. The note is also said to include some money that we are firmly instructed to use only in case of a real emergency.