"Every day is an extra day", George Lucas said.
In June of 1962, an 18-year old George almost died after making an illegal left-hand turn. Another car broadsided him. His car flipped multiple times, the force of which broke his seat belt, ejecting him from the wreckage. It was by sheer luck that George survived.
It was because of this moment – this near-death (or near-life, depending on how you look at it) experience – that George Lucas gave up his aspirations of being a race car driver and channelled his passion into film.
Austin Kleon, in his book Show Your Work!, says "obituaries are like near-death experiences for cowards". They're a showcase of the achievements of others, sure, of what they contributed to the world. But they're also a reminder that we could leave this world at any moment. They're a reminder to appreciate what you have.
Make the days count. Spend your time doing things that are important. Tell your friends and family how much you love them. Keep learning and sharing what you've learned with the world.
Because one day you won't get a second chance, and you'll wish you did.