Early-Onset Versus Late-Onset OCD

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Although symptoms of obsessive-compulsive disorder (OCD) can begin at almost any age, research suggests that there are two distinct periods when OCD symptoms are most likely to appear. The first period occurs around the ages of 10 to 12, or just before puberty, and the second is between the ages of 18 and 23.

People who develop OCD before puberty are considered to have early-onset OCD, while those who develop OCD later are said to have late-onset OCD. Interestingly, there may be distinct differences in the symptoms, responses to treatment, overlapping illnesses, brain structure, and thinking patterns of people with early- versus late-onset OCD.

Gender Differences

One of the biggest differences between early-onset and late-onset OCD is the ratio of males to females. Studies have consistently found that males are much more likely to develop early-onset OCD than females. This gender difference seems to balance out among people who develop OCD later in life, with males and females being equally as likely to develop the disorder.

Severity of Symptoms and Response to Treatment

It has also been noted that the earlier OCD symptoms appear, the more severe they are. Some research suggests too that the earlier you develop OCD symptoms, the more difficult they can be to treat with both psychological and medical treatments. In other words, those with early-onset OCD may need to try more medications before finding relief from their symptoms and may need more trials of psychotherapy than people whose OCD begins later in life.

However, a recent study that examined over 300 children with either early-onset OCD (before 10 years of age) and late-onset OCD (10 years of age or older) found that while there were differences in the symptoms between these two types of OCD, there was no difference in the children's response to treatment. In other words, the age of the children in this particular study did not affect their response to cognitive-behavioral therapy that was tailored to their age, with or without medication.

It looks like the jury is still out when it comes to treatment response and symptom severity in early-onset versus late-onset obsessive-compulsive disorder. More research is needed on the topic.

Development of Symptoms

Another difference is that people with early-onset OCD often have a gradual appearance of symptoms, whereas people who develop OCD later in life tend to have symptoms that come on quickly since they are usually tied to some sort of trigger, like a stressful life event such as the death of a loved one, loss of a job, or failing out of school.

An exception to this rule is pediatric autoimmune neuropsychiatric disorders associated with streptococcal infections (PANDAS), an autoimmune form of OCD that affects only children and in which symptoms appear very quickly.

OCD and Comorbid Illnesses

Obsessive-compulsive disorder often occurs with other illnesses, which are called comorbid illnesses. The types of comorbid illnesses that occur with OCD seem to be influenced by when the OCD symptoms started. For example, while people with early-onset OCD tend to have high rates of tic disorders and Tourette’s syndrome, late-onset OCD is more commonly associated with depression and other anxiety disorders like generalized anxiety disorder or panic disorder.

Brain Differences

The brains of people with early-onset versus late-onset OCD may be different from one another as well. Brain imaging studies suggest that people with early-onset OCD have a reduction in the size of certain brain regions that are not evident in people whose OCD started later in life.

Interestingly, however, studies have consistently demonstrated that people with late-onset OCD score poorer on measures of cognitive (thinking) function than do people with early-onset OCD. It is not yet clear why this is the case and whether this has any impact on treatment.

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