Is birthday called birthday or birthday?

Birthday and birthday can both be used to describe birthdays, but they are slightly different in context and usage. The following is the relevant introduction:

1, Birthday usually refers to an individual's birthday, especially "Yangshou" in China traditional culture, that is, the birthday of each lunar year from the date of birth. It emphasizes age and life experience, and implies a blessing for longevity and health.

2. Birthday refers to the traditional custom of honoring the elderly and celebrating their birthdays, especially the "Yin Shou" in China traditional culture, that is, the time from birth to death. It emphasizes the celebration of old life and is often used by the elderly, especially those over 70 years old.

Generally speaking, "Birthday" focuses more on individual birthday celebration, while "Birthday" focuses on the birthday activities of the elderly.