At what age can you have fixed bridge?!

At what age can you have fixed bridge?

My friend is 20 years old and she needs to have 2 or 3 fixed bridges due to her baby teeth. The permenet teeth just never grew.

Is she too young for it?? Please give good advices and if someone had this problem before like my friend is having it right now, I'll be glad if you will share it with me.

Thanks for an advance!

I agree with Jamrdh. Implants are best option. if too costly, can consider a Maryland bridge made out of resin material so that the teeth on either side of the space do not need to be severely prepared, as they would with a traditional bridge.