Earth's water is older than the Sun. This is because Earth is an ancient evolved star that is vastly older than the Sun. It had synthesized its water earlier in its evolution as a red dwarf, brown dwarf star. The synthesized water then condenses and rains onto the interior cooling it further forming the "planet".
Someone please let them know that star evolution is planet formation itself.
So long story short, establishment dogma has the water being formed in cold vacuum of outer space, when then gets magically transported to the Earth via large dump trucks.
Stellar metamorphosis has it as being one type of molecule (out of many thousands) which was formed as a direct result of the star cooling becoming the "planet".