Most great people became great because they did small things with great care. Nothing is too small for them, that's why they became great. The person who does 'great' things from day one is one who has not been tested yet. Doesn't matter how old he is biologically.
PS: And if sometimes they (the great people) don't do certain things, it is not because they are too small. In fact, many great people don't like to attend many high-profile all-important functions but choose to stay home to do the 'small' things (like playing chess or eat dinner with their kids or whatever they find more meaning in doing).