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Conception to birth; divided into germinal, embryonic, and fetal stages; involves crucial development of body structures and organs.

Birth to 2 years; rapid growth; development of motor skills; beginning of symbolic thought.

Ages 2 to 3; increased independence; language development; toilet training.

Ages 3 to 6; further development in social skills; gender identification; foundational learning.

Ages 6 to 12; refinement of motor skills; development of friendships; beginning of logical thought processes.

Ages 12 to 18; puberty; development of identity; exploration of personal values and beliefs.

Ages 18 to 40; establishing personal and financial independence; considering family formation.

Ages 40 to 65; awareness of mortality; maintain existing social ties and career; experiencing menopause or andropause.

Age 65 and older; reflection on life; dealing with health issues; wisdom.