Trajectory of behavior and emotional problems in autism.

Gray et al. (2012) followed the same people with autism for 18 years. They checked behavior, mood, and autism signs again and again.

The team wanted to know if problems get better, worse, or stay the same as people grow up.

Small gains showed up. Tantrums, anxiety, and rigid habits eased a bit.

Still, most adults kept clear behavior and mood troubles. The gains were not big enough to drop clinical concern.

Fecteau et al. (2003) saw the same gentle upward slope earlier. Their 5-year follow-up also found social skills improve little by little.

Edgin et al. (2017) looks opposite at first. They say new autism cases today are milder than old cases. The gap is about cohorts: Kylie’s group was diagnosed when rules were stricter, so they started with more intense symptoms.

Roberts et al. (2008) add a warning: even if base symptoms ease, one in six adults will pick up a new mental-health diagnosis like OCD or mood disorder.

Do not assume “maturity” will fix serious behavior or mood issues. Keep behavior plans, anxiety screens, and crisis supports in place across the lifespan. Re-evaluate every few years and watch for new disorders popping up in adulthood.