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None, they are for driver only.
If you mean how old you have to be to ride with the driver, then it depends on the policy of his company. Many independent truckers drive with their families and children, but some companies have policies against passengers.
85 to 215 passengers - depending on the model !
None.
There are no age restrictions in Virginia for motorcycle passengers. http://home.ama-cycle.org/amaccess/laws/result.asp?state=VA
The original Wright Flyer held no passengers, only the pilot.
Take the number of passengers the jet ski can hold, subtract the number of people towed, and that's how many people can ride. One of them must be the driver. One of them must be the observer, to alert the driver if the person towed is in distress so the driver can concentrate on driving. This means you need a 3-person jet ski to tow one person.
Passengers fly on a plane.
A 747-400 with 3 classes of service holds about 416 passengers. With 2 classes of service it can hold 524 passengers.
Two in front, two in back.
Only the driver.
Only the driver.