The phrase "reach manhood" implies the attainment of maturity and self-reliance. There are various synonyms for this, including coming of age, reaching adulthood, achieving independence, attaining majority, and transitioning into a fully-grown individual. Other ways to phrase this could include phrases such as reaching the age of responsibility, reaching the age of accountability, or reaching the age of reason. Ultimately, each of these synonyms speaks to the same idea of reaching a milestone in one's life where they are no longer seen as a child or dependent, but rather as a fully-realized adult capable of making their own decisions and taking responsibility for their own actions.