America: drive at 16, shag at 18 & drink at 21. Priorities?
(P.s of course you can't watch porn at 16 and not 18 because at 16 you're still classed at a child)
*US: 18 to marry (19 in Nebraska, 21 in Mississippi), 16 in most states with parental permission only, with only a handful allowing younger marriage with parental permission; 18 to join the military without parental consent, 17 with parental consent, while there are waivers for younger they're pretty rare; 18 to vote. So a pretty straightforward "21 to drink, 18 for everything else." Have you never heard of Google?
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I realise that this may appear viciously forthright, and so I dedicate my most humble apologies.
(P.s of course you can't watch porn at 16 and not 18 because at 16 you're still classed at a child)