When should you or should you ever give up on your dreams?

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Many of us have wonderful dreams and ambitions.We dream about the kind of life we want,we dream about eternal love,we dream about the material things we would like and we dream about things we would like to do.Many of these dreams are sugar coated and fitted with such grandeur,it would make even kings blush.Many of us will never achieve these dreams,even in two lifetimes,so what then? I am wondering if dreams could have a negative impact on our lives?.We are always hearing that we should dream,it gives us wings to fly and it gives us a milepost to work towards.Should our dreams be grounded in reality so that they are more achievable or the sky is the limit.Is it possible that there are somethings we can never achieve?.For example should a little black child from the deep rural Africa dreams of being the president of Sweden,is that achievable or should such a dream be tempered with some reality,maybe try for the president of his country?.The reason I am looking at it from this perspective is that when we have dreams of such opulence,arent we setting up our selves for a big disappointments.Isnt it possible too that when we fail to achieve these visions of grandeur it will affect us psychologically and impact on our self esteem.However,when we set more achievable targets then we stand a greater chance of succes if not in its entirety in part. Or do you believe that dreams should have a shelf life and if these dreams are not achieved within a certain time,we should give up on them.Lets be practical,you are eighty years old you have been dreaming since you knew what dreams are,of becoming a fireman but you never achieved it up to that point,isnt it time you gave up on that dream.Or do you still believe in your hearts and recieve some sort of psychological remuneration from it.Would it be more achievable too if you break up big dreams into part and try to achieve these dreams in smaller parts .So the little boy in rural Africa should first be a local representative in his school,then his community,then his nation and from there the United Nations and finally Sweden.Dont get me wrong I am not suggesting because of the obstacles involved we shouldnt dream ,just saying maybe a little less opulence could save your sanity and improve you self esteem.Ofcourse there is the view "The greater the battle ,the greater the victory" There are still some who believea damantly that you should never give up on your dreams,thats like blasphemy,its a fight to the end and you only fail when you give up. What do you think?