Happy Birthday! Your words resonate, even though I am a decade ahead of you - because the desire to learn, experience, see, and know the world never disappears from an artists soul.
Simple is an illusion for the most part. Sure, there are individuals that are content with just existing, serving the status quo, but far more human beings ache for the taste of more than you might think. We've just been taught to shut those parts of us down, to view them as wrong or not in alignment with how life is "supposed to" be.
And while it is true that age doesn't really matter when it comes to experiences, you are correct that it is always there, a marker of who, what, and where you "should" be...my advice is to eliminate "should" from your vocabulary and live each day as it's own mini-lifetime. How do you want to remember your 29th birthday? Your 29th January? What adventures will lead the way to 30?
They can be simple, or they can be the kind of adventures that feed your soul. ♥ All the best to you!