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Begins when a sperm penetrates the egg and continues until birth. The process takes about 38 weeks to complete and in terms of growth, is considered the fastest growth period of all the stages. It is also the most vulnerable stage of the lifespan in terms of making it all the way through the prenatal stage and the process of birth.

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Starts at birth and approximately ends when they turn two. By the end of this stage infants have developed their motor skills and can walk, use simple words, identify people who are familiar to them, play social games, and throw tantrums when they do not get what they want.

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Starts at the end of infancy and continues until the age of six. This stage is characterised by slow and steady growth and accomplishing new skills. Children learn social skills which allow them to interact with other people, they make friends, are able to eat with adults at the table and become toilet trained.

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Starts at the age of six and ends at the age of twelve. This stage is also characterised by slow and steady growth,  many physical, social, emotional and intellectual changes occur also. They develop the ability to read, write, develop long-term memory, understand gender stereotypes and motor skills.

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Starts at twelve years of age and ends at age eighteen. At this stage physical changes occur in order to achieve sexual maturity and therefore the ability to reproduce. Youth also change socially, emotionally and intellectually as they become more independent, form more complex relationships and develop life goals. The end of this stage is characterised by reaching a level of maturity across all aspects of development.

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Starts at the age of 18 and ends at the age of 40. Physically, this stage is characterised by the body reaching its physical peak around the age of 25–30, followed by a steady decline in body systems thereafter. At this stage people become focused on building a career, they may also choose a life partner, get married and have children.

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Begins at the age of 40 and ends at the age of 65. At this stage people experience a stability in work and relationships, the further development of identity, including the maturation of values and beliefs, financial security, physical signs of ageing and, for women, menopause. Children may gain independence and leave home, giving the parent a new sense of freedom but this can also create a sense of loss or loneliness, often referred to as ‘empty nest syndrome’.

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Occurs from the age of 65 up until death. It is characterised by a change of lifestyle because of retirement and financial security, this leads to greater participation in voluntary work and leisurely activities. As their health and wellbeing begins to decline, they tend to reflect on their lives and their achievements which may provide a sense of satisfaction or regret, depending on how they view the choices made in their lives.