Psychological aging is complex and varies between individuals depending on personality and ability to adapt. Those who adapt well maintain an openness to experience, flexibility, creativity, empathy, self-belief, strong social support, and sense of adventure. Several theories explore cognitive, social, and personality development with aging. These include lifespan development theory, selective optimization with compensation theory, and socioemotional selectivity theory which posit changes in cognitive abilities and social interactions with age. Personality is also theorized to change or remain stable depending on the individual. Maintaining playfulness and a positive outlook through social engagement may help optimize aging.