Changes in skills for people with intellectual disability: a follow-up of the Camberwell Cohort.

Rose et al. (2000) tracked the same group of UK children with severe intellectual disability or autism for up to twenty years. They checked communication, self-care, and thinking skills again and again.

The team wanted to see if these skills grew, stayed flat, or dropped as the kids got older.

Most kids made slow but real gains in talking, dressing, and problem-solving. The youngest children at the first visit improved the most.

Skill growth did not stop in the teen years; progress kept going into early adulthood.

Huang et al. (2026) show the same upward slope in self-care, but only up to age four. After that, growth flattens. The UK cohort proves gains can continue if you watch longer.

Brignell et al. (2017) looks like the opposite: they saw toddlers later diagnosed with autism lose words between 12-24 months. The key difference is age. Babies may dip, but school-age kids in the Camberwell study still climb.

Davison et al. (2002) add a parent piece: when caregivers matched their play to the child’s focus, language gains were larger over the next sixteen years. Early age helps, but responsive parenting helps too.

Keep teaching daily living and communication skills even when clients look ‘too old.’ The data say growth can still happen in the twenties. Start early for the biggest payoff, but never shut the door.