Sure, it's obvious that when we see someone achieve unremarkable Dream which was said to be impossible - we get inspired and motivated to do the same. But despite all of that inspiration and motivation, we do not Act towards our own Dreams whatever it may be.
We always tell ourselves that "We will start moving towards our goals tomorrow!", but what happens is that the next day and the day after that, we're still there where we were - and that place isn't even an Starting point... So eventually, maybe after 20. years we will realize that we haven't moved even an inch - But this doesn't end here, because most of the people find that there's now an another problem, which is in their way; and that's the age... But seriously, does the age matter so much? No, it doesn't... The truth is, that There's only one obstacle which keeps people apart from achieving their goals - "That's Attitude."
Think about this one: How can a Blind man achieve he's goals; how can a man without legs or arms achieve he's goals; How can a man without anything at all, achieve all what he wants? How can they do it? And the answer is: "they just can"; they keep all positive and act towards their dreams with an proper attitude. That's all, because your dreams are nothing without an Proper Attitude - so start acting towards it...