двухлетний: прил.1) two-year; of two years; biennial научн.2) two-years-oldдвухлетн|ий -1. (о сроке) two-year attr. ; of two years после сущ. ;2. (о возрасте) two-year-old, of two после сущ. ;3. бот. biennial;
долголетний: прил. longstanding; of many years (standing) - долголетняя дружбаlongstanding ; of several years ;