Gen X is the 401(k) 'experiment generation.' Here's how that's playing out.

Generation X has been the alpha tester for the 401(k) retirement system, and the gloomy results are rolling in.

Nearly half of Gen Xers say their retirement savings are behind schedule, according to the newly released Goldman Sachs Retirement Survey.

"Many Gen Xers got a late start transitioning to 401(k) plans and struggled to catch up," Chris Ceder, a senior retirement strategist with Goldman Sachs Asset Management, told Yahoo Finance.

Even now, half haven’t calculated how much total retirement savings they’ll need, how to save and invest to achieve that goal, or when they can afford to retire.

That’s significant as the oldest in this cohort will turn 60 next year.

Read more: How much money should I have saved by 50?

The 'experiment generation'

In many ways, Gen X — those born between 1965 and 1980 — has led our nation’s experiment in the shift away from a pension system to a 401(k) system, requiring individuals to save and prepare for their own retirement.

"They are the first generation to rely primarily on their own individual savings through 401(k)-like plans, and therefore, we refer to them as the '401(k) experiment' generation," Ceder said.

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Gen X is the first generation to rely primarily on their own individual savings through 401(k)-like plans. (Getty Creative) · Delmaine Donson via Getty Images

More than two decades ago, many employers began doing away with traditional defined-benefit pensions and switching to 401(k) retirement plans that workers contributed to themselves with a pocket-sized match in funds from the employer.

While pensions are still the norm for public-sector state and municipal employers, they have all but vanished in the private sector.

Today, just 11% of private employers offer pensions, compared with 35% in the early '90s. More than half of private-sector employees have a 401(k) plan, according to the Bureau of Labor Statistics.

What’s behind Gen Xers' sluggish savings rate? Credit card debt and existing loans, particularly student loans, plus financially supporting family members, the survey found.

And a big concern is that they may retire earlier than expected.

People often retire for reasons beyond their control, such as health needs, caregiving, and job loss, Ceder said.

"We are starting to see Gen Xers retiring early, and, in many cases, for these same reasons. Retiring early sounds great, but to the extent people are not financially ready, it can have a major impact on the following decades in retirement," he said.

The reality for Gen X has increasingly been noted in financial industry reports. For instance, Gen Xers say they will need, on average, $1.56 million in savings to retire comfortably, but to date, they have saved only an average of $109,600. More than 1 in 3 Gen X workers have dipped into their savings or taken out a loan to pay for monthly bills.