They would be charged
They would be arrested and charged with leaving the scene of an accident (and other charges as applicable to the specific situation). What actually happened to their licence will vary in accordance with the policy of each state, but, generally speaking, the potential licence suspension which ensued would be the least worrisome of what would happen after a situation as described above.
It depends on the circumstances and the legislation of the country concerned
That would really be irrelevant. If your licence were to be suspended, the suspension period would likely be over before you were released from incarceration after being arrested for hit and run and leaving the scene of an accident.
the driver's license would be suspended.
They would lose there license
They would be charged with leaving the scene of an accident in addition to any other charges regarding the cause. There is no requirement to help the other driver.
you woul go to jail.
He was in a car, which subsequently was involved in an accident.
As long as your teenager was properly insured and he was not involved in the commission of a crime at the time of the accident, nothing should happen to your teenagers driver license.
The person's license will be suspended or revoked, and they will be subject to criminal prosecution.
Any one that was around you would call 9-1-1 and tell them your licence number, your supposed to stop and help!
If they simply fled the scene, what happened to their licence would be the least of their concerns - they would be facing felony hit-and-run charges. If they did stop, there'd be no obligation to render aid - only first responders and medical personnel are actually obligated by law to do such.