“There is much powerful and positive evidence for a young earth, including dinosaur soft tissue discovered in dinosaur bones supposedly hundreds of millions of years in age; or the presence of carbon 14 in diamonds, coal, oil and other fossils; or global geological formations that can only be explained by invoking continental scale catastrophic flooding, such as planation surfaces, and water gaps; or the amount of salt in the world’s oceans, etc. For an extensive list of evidences for a young world from multiple perspectives see CMI’s article 101 evidences for a young age of the earth and the universe.”
See more about this question and 9 other questions here: https://creation.com/10-answers-from-creationists-1