Childhood Trauma Doesn’t End at 18. New Study Shows Why Age 19 May Be a Critical Turning Point

A person can leave childhood behind without leaving its effects behind.

New research suggests that by the time many young people are just beginning adulthood, the experiences they faced years earlier may already be linked to major differences in mental health, relationships, education and safety.

A new study published in JAMA Network Open found that emerging adults with a higher number of adverse childhood experiences (ACEs) had substantially higher rates of depression, suicidal thoughts, hard-drug use and interpersonal violence compared with peers who reported no childhood adversity.

The participants were around 19 years old on average; a period when many people are entering college, starting careers, moving away from home and building adult relationships.

The finding challenges a common assumption: that childhood trauma is something people simply “move past” once they become adults.

Instead, researchers say emerging adulthood may represent an important window; not because a person’s future is predetermined, but because support systems may still have an opportunity to make a difference before harmful patterns become more established.

The Study Looked Beyond What Happens Inside The Home

The study examined 1,850 emerging adults using the 21-item Philadelphia ACEs survey, a broader measure that captures not only traditional childhood adversity but also experiences outside the household.

Traditional ACE categories included experiences such as:

• Emotional, physical, or sexual abuse

• Emotional or physical neglect

• Witnessing domestic violence

• Household substance use or mental illness

• Having an incarcerated family member

But researchers also counted community-level adversity, including bullying, discrimination, witnessing violence, and feeling unsafe in one’s neighborhood.

That broader definition reflects a growing understanding that childhood stress is not shaped only by what happens within a family. A young person’s environment (including schools, neighborhoods, and social conditions) can also influence their experiences.

More Childhood Adversity Was Linked With Greater Challenges By Young Adulthood

The researchers found a clear pattern: as the number of reported adverse experiences increased, outcomes generally worsened.

Compared with young adults who reported no childhood adversity, those who experienced four or more ACEs had higher rates of:

But the study also found that the type of adversity mattered.

Certain experiences (including emotional abuse, sexual abuse, discrimination, and witnessing domestic violence) showed some of the strongest and most consistent associations with poorer outcomes.

ACEs are often reduced to a single number. Researchers say a score can show cumulative exposure, but it does not capture the full story of what happened, when it happened, or how severe the experience was.

The Impact Was Not Limited To Mental Health

One of the study’s most important findings was that childhood adversity was also associated with reduced academic mobility — suggesting that the effects may extend into educational opportunities and life pathways, not just emotional well-being.

That makes the transition into adulthood especially important.

At around age 19, many people are entering new environments: universities, workplaces, training programs, independent housing, and adult healthcare systems. Those transitions can create challenges, but they can also create new opportunities for support through counselors, mentors, healthcare providers, community organizations, and trusted adults.

Lead author Jeff Temple, PhD, described emerging adulthood as a period when intervention may still prevent struggles from becoming more entrenched.

“We obviously want to prevent these experiences from happening in the first place, but emerging adulthood also gives us an important window to intervene before these patterns become more entrenched,” Temple said.

Related: 10 Modern Teen Habits Parents Shouldn’t Ignore as Mental Health Concerns Rise

The Findings Fit Into A Larger Picture

The new study adds to a wider body of research linking childhood adversity with later health challenges.

A 2024 Swedish twin study involving more than 25,000 twins found that each additional ACE was associated with higher odds of clinically diagnosed psychiatric disorders, even after researchers accounted for shared genetics and family environment. Sexual abuse showed a particularly strong association with psychiatric diagnoses.

Other research has also linked multiple ACEs with substance use in young adults and with higher odds of depression, anxiety, PTSD, self-harm, and suicidality.

The takeaway is not that childhood adversity determines someone’s future. Early experiences can shape risk, and identifying that risk creates opportunities to provide support.

Childhood Adversity Is Common, Not Rare

The issue affects a large portion of young people.

CDC data from the 2023 Youth Risk Behavior Survey found that 76.1% of U.S. high-school students reported at least one ACE, while 18.5% reported four or more.

Those numbers are part of why researchers increasingly focus on prevention and support rather than simply identifying people after problems appear.

The CDC has emphasized approaches that strengthen family economic stability, improve access to supportive relationships, create safer communities, and connect young people with caring adults and meaningful activities.

A Trauma History Is Not A Prediction

Researchers caution that ACE scores should not be treated as a diagnosis or a forecast of an individual’s future.

Two people can experience similar adversity and have very different outcomes depending on factors such as relationships, resources, safety, access to care, and support systems.

The goal of ACE research is not to label a generation as damaged. Instead, the focus is on identifying where preventable harm occurs and where support can make a difference.

That support can take many forms: stable housing, mental-health care, trusted mentors, supportive schools, substance-use treatment, financial resources, and communities where young people feel safe and valued.

The new research does not suggest that childhood hardship defines adulthood.

It suggests something more practical: waiting until someone is in crisis may mean missing an earlier opportunity to help.

What do you think young people need most after experiencing childhood adversity, better mental-health access, stronger communities, supportive relationships, or something else? Share your thoughts.

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