Okay, I am 13 years old and I want a dirt bike. My friend is selling his 2002 Kawasaki kx60 for $600. My uncle is arguing with me that you are supposed to get a bigger bike so you can grow into it. Would this bike be okay? I am 5 foot 3 inches tall and weight 105 lbs. I did my research and the bike's seat is 28 inches high. Will this bike be a good, powerful, fast bike?