What is the age range for adulthood according to the developmental stages?

The age range for adulthood according to developmental stages is typically considered to begin at 18 years. This age is widely recognized as the threshold of legal adulthood in many countries and frequently marks the transition from adolescence to adulthood in various developmental psychology frameworks. The upper limit often extends to 65 years, encapsulating the period in which individuals generally achieve peak physical and cognitive development, as well as start to face the challenges associated with aging.

While options like 20 years, 21 years, or 19 years as starting points for adulthood exclude a significant portion of the population that is legally recognized as adults, the range of 18 to 65 years incorporates the entirety of the adult developmental stage as acknowledged in both social and healthcare contexts. This comprehensive range helps in addressing the healthcare needs and policies pertinent to adults as they transition through different phases of life.