Step 1: Not Hard At All!
The Concept is simple, as you get older, the less higher frequencies you can hear. But when you were younger you could here much higher frequencies then you can hear as you get older. So using a freeware program NCH Tone/Waveform Generator,
http://www.world-voices.com/software/nchtone.html ,
you can create higher frequencies that only younger people can hear.





















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PD: its a bad idea to use it on mobile phones and mp3/mp4 players with speakers, it will consume the battery in a few minutes (if its not in seconds)