A birthday is something special for everyone. One is more interested in it than the other but everyone thinks of that day. On the one hand, kids are happy about every year they become older until they are adults and are allowed everything they want. Special dates are the age of being able to get a drivers licence, the age of being allowed to stay out as long as they want or the age of being allowed to live in an own flat.
On the other hand, someone becoming 30 is sensible for every year going by and is happy about every year he or she is able to live and have fun because it is something additional and special.
That is why we have uploaded ideas for special birthdays.