A role model

A role model is a person who serves as an example, or whose behavior is emulated by others. The term first appeared in Robert K. Merton's socialization research of medical students.[1] Merton hypothesized that individuals compare themselves with reference groups of people who occupy the social role to which the individual aspires.[1]

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the absence of role models
ロールモデルの欠如

have a good role model
良いロールモデルを持つ

hypothesize
仮説を立てる、仮定する

aspire
熱望する、切望する、熱願する、目指す、志向する、垂涎する