Psychological development varies across the lifespan, with different stages such as early adulthood, middle adulthood, and late adulthood showing wide variations in physical, psychological, and social development. Each individual may progress differently through these stages based on their unique experiences and environments. Factors like genetics, upbringing, and life events all play a role in shaping an individual's psychological development. Research has shown that environmental factors, such as upbringing and social interactions, can also significantly impact cognitive development at different life stages. Overall, psychological development is a complex process influenced by a combination of genetic predispositions and environmental influences throughout one's lifespan.