Some people in Russia also follow this tradition - pulling on the ears of the person whose birthday is. Actually, I agree that it's weird :) In general, in Russia we don't have any special birthday traditions. They're is quite ordinary - celebrations, birthday cake, gifts and so on. Some people prefer to organise grand birthday parties with a lot of guests, some people prefer to celebrate their birthdays quietly among the nearest and dearest... However, most of the Russians usually celebrate the fiftieth anniversary as a particular event.

In China there are some people will eat noodle,that means longevous.

Aqui en EL Salvador, etre los amigos de los bachilleratos, le hacen la "malteada"  despues mojan al festejado y lo tiran al polvo para "empanizarlo"

Well, that depends. No particular customs like spanking.
Usually, there will be a big birthday banquet for the eldest kid by the time of his 12. Or maybe 13 in different district. But just for the eldest . Other children will just have a simple celebration among family members.