The best bike to buy for a nine year old active boy is a 24in-wheel bike with a 3-speed hub gear.
The bike that you should think of buying an active 9 year old is a 24-inch wheel bike.
The bike that you should buy for your nine year old son is that with a 20-inch wheel with suspension forks and adequate front suspension.
Its not good to weigh that much at your age . If you are nine years old and are average height you should weigh about 90-100 pounds. But your weight will depend on your shape, and how physically active you are.
Yeah if they have the right size dirt bike and gear
A nine-year-old should have about 9-11 hours sleep each night.
No.
Generally, a nine year old should have around 5 grams a day.
A ballpark value is that a used bike should be half the price of a new bike, if it's just a year or two. An older used bike should be even less.
If they are capable of spending the money on age-appropriate and useful things, then I do not see why a nine-year-old should not have $70.
Find the serial number on the engine, call up a motorsports place and they should be able to tell you what year the bike was made.
3,000 kilometers
If she's nine then a good thing to get her would be a: Bike, Scooter, A Pet, A Doll, Clothes, etc. I remember when I had my nineth birthday I got a Swiss Army Knife and then showed all my friends so they eventually all got one and we called our selves the "Ripper Nine-Year-Olds"!! Lol