Dylan Thomas-Do Not Go Gentle into that Good Night

I think that this poem is about death.  When he says,"Do not go gentle into that good night," I think he is basically saying fight death.  He says that old age should "burn and rave at the close of day" and I think that by end of day he means life.  "Rage, rage" means fight.  An early lesson that we learn in life is that someday we are going to die.  Wshen we are young we pay no attention to this lesson because we think we are invincible.  As we grow older it is no longer in the back of our minds it is real.  I think he is trying to say that when we know death is coming close instead of giving up or being okay with it we should be smart and "not go gently."