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? 
Its a good idea plus a greatest gift for your nephew.0.01 is enough money and since you're giving it after 15 year so it become double and triple.I believe everybody will be using bitcoin after 15 years .I my self save some coins for my son and i believe it will help him when he reach in university level.