It's ds's birthday in Sept. I have always organised something, eg paintball or whatever, but the last year or two none of his mates have bothered for their 16ths (he's the oldest in his yr). He doesn't seem bothered but it would seem weird to me just to have anormal day, esp. as it's a Saturday.
He goes out most Sats to "field parties", literally they all go to the lake/river/field in the middle of nowhere and drink, fumble each other in the bushes etc, so I guess that would be the default option.
For his 18th we'll have a proper party, hire a hall or room in hotel or something.
Did your 17 yr olds do anything?