Answer:
What has been around for millions of years but is never more than a month old?
What is always coming but never arrives?
What is filled with air and sometimes a gas, tied to a string and often seen on your birthday?
Makes apples fall from trees
Though I should be unique, you've made most of us the same. I would be stronger, if my characters were stranger.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?