It is unclear what you mean by "half past years old." If you are referring to a specific age, such as being halfway between two ages, you would typically just celebrate your birthday as you would any other year. If you mean something else, please provide more context for a more accurate answer.
It is unclear what you mean by "half past years old." If you are referring to a specific age, such as being halfway between two ages, you would typically just celebrate your birthday as you would any other year. If you mean something else, please provide more context for a more accurate answer.