This is not really a question in the strictes sence, General things like this , where each and every person has a differnt view and there is no right and wrong. should be posted in the discusion forum.

In Germany when are still young, still kids, we get present from family and friends. Often there is some kind of party the next weekend. It is very normal to bring a gift. Within the office people shake your hand and congratulate you, you do something nice as well like bringing cake, or lunch, it´s best to learn what to do in each and every workplace by observing the co workers and copy. Some Birthsdays are more special then others 16,18, 30, 50, 60, 65, 75, 80, 85, 90, 91, 92 so on. If it´s a special birthsday the party gets bigger and most often more formal, like taking place in a restaurant. It all depents on the person and social group your within.

Greetings: Alles Gute Zum Geburtstag. Other than that, I don't think birthday parties change from a country to another!