Homework

• Bob is born
• Bob loses his first tooth
• Bob is tall enough to ride the roller coaster
• Bob starts middle school
• Bob gets his driver’s license
• Bob graduates from high school
• Bob joins the Marines
• Bob gets married

The ones that could be in different places are being tall enough to be on a roller coaster, getting his driver's license, joins the marines, and gets married.
It's not possible to know because you can marry at any age. If I had to guess I would guess 22 so he could go right out of high school to the marines, then come home and get married