Your desire, who you are now, and what you want to become. What does the word DREAM mean to you? What does your own dream mean to you? If you're avoiding these questions just because they're hard to answer than you're doing a big mistake, it doesn't matter how OLD you are, it doesn't matter how YOUNG is.
This question matters so much, because like or not our dreams don't just disappear. It may be forgotten because you decide to shut it down, but when you are on your death bed. You will REMEMBER EVERYTHING and you will regret not chasing your dreams when you had the chance.