Cognitive development continues into early and middle adulthood according to recent research. During early adulthood, thinking develops beyond Piaget's formal operations stage into postformal thought characterized by relativistic and experience-based problem solving. Intellectual growth follows stages of acquisition, achievement, responsibility, and executive function. College education promotes cognitive growth through mastery of knowledge and complex understanding, though access to college varies between demographic groups. In middle adulthood, fluid intelligence like reasoning declines while crystallized intelligence like knowledge increases, allowing for expertise development and selective optimization of skills to compensate for losses. Memory also shows some decline in retrieval efficiency but effective strategies like organization, attention, visualization, and rehearsal can support recall.