Naseri, D., Cahyani, A., Manalu, H.G. and Angellina, V. 2018. Correlation Between Age and Knowledge Among The Student of SMP "X" with The Occurrence of Free Sex. Journal of Medicine and Health. 2, 1 (Feb. 2018). DOI:https://doi.org/10.28932/jmh.v2i1.739.