Milestones for babies and young children include learning to walk, speaking in short sentences and asking what words mean. Milestones for children and teenagers include attending the first day of school, learning to read and graduating. Major adult milestones include getting married, buying a house, having a baby and retiring.
Milestones are significant events that either contribute to a person's growth or change him significantly. The age at which a person reaches milestones varies. Not everyone reaches the typical human milestones. For example, many people never graduate high school or marry. Certain milestones, such as buying a house and having a baby, require a significant amount of work and preparation.