U.S. policies increasingly limit lesbian, gay, bisexual, transgender, queer, or another marginalized gender identity or sexual orientation (LGBTQ +) education topics for children under the guise of age-appropriate curriculum, placing the responsibility of educating children about LGBTQ + identities and experiences on parents. We examined parents’ beliefs about the age-appropriateness of LGBTQ + topics for children, with implications for parent–child conversations and support for restricted LGBTQ + curriculum. In two studies, LGBTQ + and cisgender-heterosexual parents’ ( N = 837) belief that LGBTQ + topics are age-appropriate for children at an older age was related to fewer parent–child conversations about LGBTQ + topics and greater anticipated discomfort having such conversations (Studies 1 and 2). Counter to hypotheses, exposure to restrictive LGBTQ + education policies did not affect age-appropriateness beliefs (Studies 1 and 2). In line with hypotheses, parents’ belief that sexual orientation discussion should be minimized was associated with later age-appropriateness beliefs and greater support for restricting LGBTQ + curriculum (cisgender-heterosexual parents; Study 2). These studies highlight age-appropriateness beliefs as a key mechanism hindering critical parent–child LGBTQ + conversations.