translate English to French:  In a US10 study comparing 1,508 older drug users (IDU and crack/ cocaine smokers over the age of 50) with 1,515 younger drug users (under the age of 50), older drug users were found to be less likely to have had sex in the prior month, but those who had had sex reported as much risky behaviour as their younger counterparts.
ans) à 1 515 utilisateurs de drogues plus jeunes (moins de 50 ans) a montré que les utilisateurs de drogues âgés étaient moins enclins à avoir eu des relations sexuelles dans le mois précédent, mais que ceux qui en avaient eu couraient autant de risques que leurs homologues plus jeunes.