My birthday

I just had a birthday a little over a week ago. I'm not saying how old I am, but in base 7, it makes a nice round number. I wouldn't mind if I were to stop incrementing my age here, but as my grandfather once lamented, at a time when he was suffering some setbacks in his health, "You can't stop it... You just can't stop it."

Or can you? It got me wondering if it might be possible to reverse time, but I think this would only be possible in a universe where the following statement could sometimes be true: A caused B; therefore, A happened after B. Until someone can show me an example of this, I'll have to side with Grampa.