Age is an illusion. There is no basis for time in existence. It is totally a human concept. There is only eternity. The calender and the clock are man made products imposed on nature. There are no 24 hours in a day because hours do not exist. Nature is not counting time, only man is. It is an illusion of the mind. The other animals are unconcerned with time, calenders and clocks. Even your birthday only happens one time, that day. You don't keep having birthdays over and over, only one. So nobody knows how old they are. They are just here in a body, and then they leave. Anniversaries are illusions too because nothing in nature repeats itself, it does not return. Whatever happened, has happened. It does not keep happening. Man's memory wants continuity of events. But there is no continuity, they do not return. He only pulls up the memory of old concepts and events again and again and calls it an anniversary for his memories sake. They no longer exist.