CHICAGO (AP) — Some younger workers aren’t particularly thrilled to see a rising share of older Americans forgo retirement and continue working, according to a recent poll by The Associated Press-NORC Center for Public Affairs Research.

The poll found that workers under the age of 50 were significantly more likely to view America’s aging workforce as a negative development when compared with their older counterparts. About 4 in 10 respondents ages 18 to 49 and 44% of the youngest respondents ages 18 to 29 said they consider the trend to be a bad thing for American workers. Just 14% of those age 60 and over said the same.

“I don’t think in things like IT and medicine you’re as effective a worker (at 65 years old) as you are at 50,” says Katie Otting, a 29-year-old living near San Diego. “If some 65-year-old is in a position that he’s not ready to quit because he wants a better pension and there’s someone else ready to take that job, they’re not going to replace him.”

An aging population, elevated health care costs and lingering financial uncertainty following the Great Recession all are believed to be contributing to America’s steadily graying workforce. Nearly 20% of Americans over the age of 65 were employed or actively looking for work last year, up from less than 12% two decades prior, according to the Bureau of Labor Statistics.

But the increased prevalence of older workers has led some to believe seniors are holding back the country’s economic momentum by remaining in the workforce. Men were slightly more likely than women to cite the aging workforce as a problem for U.S. workers (32% to 27. And about a third (34%) of more affluent respondents earning more than $100,000 annually said the same, slightly more than the 24% of those earning less than $30,000 who said so.

By contrast, about 6 in 10 Americans age 60 and over say the trend has actually been a good thing for the economy, compared with 3 in 10 Americans under 30 who think that.

About a third of Americans under 50 who have noticed the trend in their own workplace believe the aging workforce has negative implications for their own careers.

“One of the myths that’s out there causing younger and older people to butt heads is the idea that ‘Oh, it’s because these older people are on the job preventing me from getting the job I want,'” says Steve Burghardt, a 74-year-old professor of social work at the City University of New York who thinks Americans are “looking for someone younger or someone older to blame” for inequality, job displacement and other economic problems.

Research is mixed on the aging workforce’s overall impact on the U.S. economy. Adam Ozimek, a senior economist at Moody’s Analytics, says his prior research efforts have suggested a growing population of older workers can slow productivity and ultimately hamper wage growth for the rest of the labor market.

But he says there’s little evidence to suggest that the presence of older workers is “crowding younger workers out of promotions,” noting that many of the workers who would naturally move up and replace positions currently held by baby boomers are not millennials but rather middle-aged members of Generation X.

“In anxious times, we look for scapegoats. And old people are a ready scapegoat, especially if you are forced out of having a public presence or are forced (out of a job),” says Ashton Applewhite, a New York-based writer and ageism activist.

The idea that older workers are keeping jobs away from younger Americans, preventing them from moving up the corporate ladder into higher ranking, higher paying positions, is not a new one. But economists say it doesn’t have much basis in economic reality.