- Wikipedia says the age of the universe is 13.8 billion years and that the Schwarzchild radius of all the mass of the observable universe is about 13.7 billion light years. Is this just a coincidence or is there more to these numbers? https://www.reddit.com/r/askscience/comments/b8dyuw/wikipedia_says_the_age_of_the_universe_is_138/ 3 comments askscience