At what age does intellect peak, according to research?

Research suggests that intellect, particularly aspects of cognitive function such as problem-solving abilities and fluid intelligence, may peak around the age of 30. This concept is often linked to the idea that certain cognitive abilities, which rely on speed, memory, and abstract reasoning, tend to reach their optimum performance in early adulthood. After this age, while some cognitive abilities may decline, others like crystallized intelligence—knowledge and skills accumulated over a lifetime—can continue to grow with experience. Therefore, pinpointing the age of 30 aligns with research findings that examine cognitive peaks, providing a framework for understanding how adult intelligence evolves over time.