Traditionally, a cake is studded with the same number of lit candles as the age of the individual or a number candle representing their age. This is a common practice during birthday celebrations where the number of candles on the cake corresponds to the person's age. It is a way to symbolize the passing of another year and to make a wish before blowing out the candles.

A birthday is the correct answer because it refers to the occasion when a person or institution celebrates the anniversary of their birth. It is a special day that is commemorated each year to mark the day of someone's birth. A birthdate, on the other hand, simply refers to the specific date of someone's birth and does not necessarily imply a celebration or anniversary. Therefore, the correct option in this case is "A birthday."

Birthdays are celebrated in numerous cultures, often with gifts and parties. This is because giving gifts is a way to show love, appreciation, and thoughtfulness towards the birthday person. Parties are organized to bring friends and family together to celebrate the special day, creating a joyful and festive atmosphere. Therefore, both gifts and parties are common ways to celebrate birthdays in various cultures.

In the Philippines, a coming-of-age party called a debut is celebrated when girls turn 18th. This celebration marks the transition from adolescence to adulthood and is a significant milestone in a young woman's life. It typically includes a grand celebration with family and friends, a formal program, and the debutante's introduction to society.

In America, someone is considered mature at the age of 18. This is because at this age, individuals are legally recognized as adults and gain certain rights and responsibilities, such as the ability to vote, serve in the military, and make independent decisions. It is also the age at which they can legally enter into contracts and be held accountable for their actions in the eyes of the law.

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The royal family sends British Commonwealth nations cards to celebrate the 100th and 150th birthdays.

In Japan, there is a Coming of Age Day celebration for individuals who have turned 20 years of age. This day is significant as it marks the transition from adolescence to adulthood in Japanese culture. It is a time when young adults are recognized as responsible members of society and are granted certain rights and privileges. This tradition reflects the importance placed on reaching the age of 20 as a milestone in one's life.

The Grand Duke's Official Birthday in Luxembourg is on June 23.

The correct answer is April 16. This answer states the actual date of birth of the Grand Duke, who is a monarch in Luxembourg.