Laser Tag is an excellent choice for a 14 year old birthday. It can be made into a co-ed event, it's competitive and fun and the children are active. Try and even out the teams to make it fair for all.
Its not bad its just like having a handheld laser shined in your eye. It won't hurt ones or twice but be sure to wear some sunglasses when playing laser tag. Also, make sure its not for a long duration. But your OK if you did.
If you are asking about the Laser Shield - License Plate Laser Deflector. The answer is a big NO! Totally worthless.
Laser paint contains a phosphorescent pigment. When UV or light falls on the pigment the energy is stored and released again over time, causing the 'glow'. The laser emits the energy, and it does so in an extremely narrow beam, making it possible to 'write' with it.
Zone laser tag is a company that provides laser tag systems on a franchised basis. The number for their sales department is 877 484 9621.