Have a look at this recent thread. I think it answers most of your queries.
There are certainly 17 years old - and younger! - driving scooters. Whether that is legal hopefully someone will confirm. Whether it is advisable I'd recommend you observe driving conditions and habits where you are staying before you decide.
Hear hear Arandora.!!..
And a motorcycle riding skills course at home would'nt go astray neither....
Highly recommend your son does a ridng skill course before attempting to ride a scooter in Thailand...
This will help him no end and in turn teach him to ride defensively...
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