and middle-aged adults (χ2 = 1.62, df = 1, p = .203) or between emerging adults and middle-aged adults (χ2 = 4.31, df = 1, p = .038). The association between friend support and alcohol use also varied across adulthood (χ2 = 17.94, df = 2, p < .001). Greater social support from friends was associated with higher alcohol use in emerging adulthood (B = .17, CI [ .05, .28], SE = .07, β = .08, p = .018), but lower alcohol use in young adulthood (B = −.22, CI [−.32, −.11], SE = .06, β = −.10, p < .001) and middle adulthood (B = −.18, [−.29, −.07], SE = .07, β = −.09, p = .008). These associations significantly differed between emerging adults and young adults (χ2 = 16.05, df = 1, p < .001) and between emerging adults and middle-aged adults (χ2 = 11.92, df = 1, p < .001), but did not differ between young adults and middle-aged adults (χ2 = .16, df = 1, p = .687). There were no significant differences in the effect of alc-PRS in relation to alcohol use across developmental stages. The interaction between alc-PRS and social support from friends was
