The "Razor Tretfahrzeug RipRider 360 Lightshow" is designed for children aged 5 and over, but it's important to consider the dimensions and load capacity of the vehicle for a 10-year-old boy of 140 cm.

- Age recommendation: From 5 years old, which suggests that the vehicle is primarily designed for younger children.
- Dimensions and weight capacity: Although exact specifications for maximum height and weight are not given in the sources, it is generally advisable to check these details to ensure that the vehicle can support the height and weight of a 10 year old.

In general, a boy of 10 years and 140 cm could be too tall and heavy for this vehicle, but it would be prudent to check the manufacturer's precise specifications for definitive confirmation.