Do 16 year olds ever get cancer?

Yes. Unfortunately anybody at any age can get cancer. It is rare in childhood and becomes much more common in the elderly.
Yes. Incidence is 21.8 per 100, 000 (age 15-19) people. A breakdown by age is shown at: http://apps. Nccd. Cdc. Gov/uscs/cancersbyageandrace. Aspx? Gender=male%20and%20female&count=false&population=false&datatype=incidence&ratetype=ageadjtype&cancersite=all%20cancer%20sites%20combined&year=2008&site=all%20cancer%20sites%20combined&surveyinstanceid=1.