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? 
It is a pretty nice idea to gift your nephew some bitcoins as he will also learn about some investing and also will be having an example on how a small investment can give tremendous returns in the future but you must make a backup of that wallet as it's pretty easy to loose a paper wallet if not kept safe and there have been times when the people have lost their printed paper wallet in some place like in their old table which they have thrown and also they lost their digital wallet in a hard drive.