Intelligence is a complex trait influenced by a combination of genetic and environmental factors. While cognitive abilities can change throughout one's life based on experiences, education, and brain health, age itself doesn't necessarily dictate intelligence. Some aspects of cognitive function may decline with age, such as processing speed and certain types of memory, while other aspects, like wisdom and accumulated knowledge, may continue to improve. It's important to recognize that intelligence is a multidimensional concept, and different individuals may experience unique trajectories over their lifespan.