If we don't accept any common beliefs, we can't exist in spacetime. But when we don't believe in age, at least we don't have to die because our numbers change. [...] When you don't believe in birthdays, the idea of aging turns a little foreign to you. You don't fall into trauma over your sixteenth birthday or your thirtieth or the big Five-Oh or the deadly Century. You measure your life by what you learn, not by counting how many calendars you've seen. If you're going to have trauma, better it be the shock of discovering the fundamental principle of the universe that some date predictable as next July.