Currently both, researchers and politicians, are interested in analyzing the many dimensions that are the components of subjective well-being of children and adolescents, since little attention has been paid by the literature to these groups, when compared with adults. In this research we analyze the cross-cultural comparability of three measures of subjective well-being of members of the Freshman Class of High Schools in Brazil, Chile, Spain and Romania. The multi-item scales reveal a good fit with the aggregated samples, as well as with the respective multi-group models with bounded loads, supporting the comparability across correlations and regressions performed on the populations. However, the models do not fit when both loads and constants are bounded, suggesting that the means are not comparable between countries. Also, results reveal that the scores of subjective well-being are higher than those expected from western adult populations.