I was around 15 when I first wanted to compete in an Olympics. I even remember the first time I got to wear a GB kit as a junior. I've even kept it. It's in my mum's loft somewhere, probably gone mouldy by now.
It would be a lot different for me because there is a lot of information that you need to know about as a player. How pitchers are pitching you, how defenses are playing, certain situations about certain pitchers.