最后一句话里的die如何理解?When the aerials are down,and your spirit is

最后一句话里的die如何理解?
When the aerials are down,and your spirit is covered with snows of cynicism and the ice of pessimism,then you are grown old,even at 20,but as long as your aerials are up,to catch waves of optimism,there is hope you may die young at 80.
一旦这天线坍塌,一旦你的心灵被玩世不恭和悲观绝望的寒冰酷雪所覆盖,即使你只有20岁,你便已衰老了；但只要天线始终矗立在你的心中,在捕捉每一个乐观向上的电波,你便有希望在80岁的年纪仍拥有一颗年轻的心.