In many ways, reaching age 18 means reaching adulthood. This is the real beginning of adulthood. So it seems that a party commemorating such an event should be fun, but not too childish. You can look for the best paintball party ideas by clicking at- 

Host Paintball Birthday Parties – Special Deals – Paintball USA

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One idea might coincide with a college attending the party. Birthday parties are likely to start college soon so college birthday themes can be fun. Maybe a visit to the college and a party at a nearby restaurant would be nice. Or you can throw a brother/sister themed party at home and eat some mysterious meat.

A simpler party at home can focus on food. The whole pizza party will be fun. With a built-in dessert bar with ice cream and all the binding elements.

But maybe your 18-year-old will find the above ideas too childish. Another idea is to take your teenager and friends to an amusement park for the day. Give them a ticket and let them spend the whole day there then go home for pizza or ice cream or whatever.

Another party idea is to hire a DJ and play some music. The party can be at home or at a hired entertainment center for the day. You need to find the right kind of DJ that has the best music and equipment. Another musical idea is for each invited teenager to bring a CD they like and play it at the party.