дълголетен означава в английски

long-lived [longer-lived, longest-lived]▼(having a long lifespan; surviving for a long period of time)
adjective
[UK: ˌlɒŋ ˈlɪvd] [US: ˌlɔːŋ ˈlɪvd]

longevous▼(Long-lasting)
adjective
[UK: lɒn.ˈdʒiː.vəs] [US: lɑːn.ˈdʒiː.vəs]