<prompt> Translate the following text to SwahiliSeveral studies have found a significant effect of age on the value of mortality risk reductions expressed by citizens in the United Kingdom Jones-Lee et al.  <response>: Uchunguzi kadhaa umegundua athari kubwa ya umri juu ya thamani ya kupunguza hatari ya vifo iliyoelezwa na raia nchini Uingereza Jones-Lee et al. 