Re: I'm just thinking about to give away to my 4-year-old nephew a 0.01 BTC
That's the max that I can afford at the moment (I'm 22) but I want to save it on a wllet of paper and give it to my sister telling her to keep it safe and that we will give it to him when he is 18 years old. Do you think is a nice idea? 
If I were you, I would not be in a hurry, but would collect a little more, at least 1 BTC. After all, there is no urgency to make a gift right now, so the more you give, the more pleasant your nephew will be. I consider you a very reasonable and generous person.