While young adults do not grow significantly taller in their 20's, they typically grow stronger and healthier as their bodies reach adult size. In terms of overall health, as well as peak physical condition, early adulthood is the prime of life. With each year from 20 to 40, signs of senescence-the state of physical decline, in which the body gradually becomes less strong and efficient with age-become more apparent. All the body systems gradually become less efficient (though at different rates) and homeostasis takes increasingly longer to reach.

Cognitive:

As an individual takes on the responsibilities and commitments of adult life, thinking may become more adaptive, practical, and dialectical to take into account the inconsistencies and complexities encountered in daily experiences. Partly as a result, moral thinking becomes deeper and religious faith becomes more reflective, with more appreciation of diverse viewpoints and also more commitment to one's own convictions...