Between 1945 and 1965, middle class-adults and community leaders in Singapore established new state-sponsored movements and institutions to deal with the problems of youth and to create ideal disciplined and multi-cultural youth. They were motivated by their socio-political anxieties about the young and their desires to mobilize and exploit the latter’s qualities and energies for their respective colonialist and nationalist projects. The Singapore Youth Council (1948-1959) and the Singapore Youth Sports Centre (1956-1959), which were set up by two different groups of community leaders and expatriates in Singapore under British auspices are two key examples of such movements. Through the histories of the two movements, this paper shows how late colonial local elites and middle-class professionals in Singapore constructed youth as the solution to the management of racial, class, and ideological differences and valorized the minds and bodies of the young as the map and index of the envisioned new colony and nation. Accordingly, they endeavoured to assert biopolitical power over the unruly, restive, or else war-afflicted bodies of children and young. These in turn shaped age relations and state-society relations in decolonizing Singapore, as well as in independent Singapore, after the ruling People’s Action Party adapted, expanded, and institutionalized these colonial era discourses and institutions for similar agendas.