Here, in Brazil, there are a many different forms to celebrate birthdays, but I don't think they are actually that different. When I was a kid, I used to have thematic parties with friends and family. Growing up, since I was a teenager (and now as a young adult), I get used to celebrate my B-day with my closest family (mom, dad, brother, gradmother and my great gradmother - yes, I am lucky enough to have this big little family, thank God). I kinda don't care that much about parties because I like small and simple. Just cake, a lot of food and family reunited. That's perfect to me. Now, about other people.... They can do exactly the same thing that I just said or can go crazy and drunk with friends because it's not a regular day, you know? They also can go to a restaurant, to a concert, to cinema or whatever. In the end of the day, most people are gonna to have a day out of the routine. It's not completly out of the box.