how long is passport good for
Submit. Â· just now. Report Abuse. for an adult, an american passport is good for 10 years. If you are a teenager, I think it is good for less time (5 or 6 years) I think they do that because you can change alot from teenage years to adulthood or not.Maybe it's good ol' uncle Sam's way of squeezing more money out of us one way or another.f you are a teenager, I think it is good for less time (5 or 6 years) I think they do that because you can change alot from teenage years to adulthood or not. Maybe it's good ol' uncle Sam's way of squeezing more money out of us one way or another.