I recently came across a very well-known Christian apologist and he shared how he did not feel that the Bible teaches young-earth Creationism, but rather, he said that he believes that there are good hints within the Bible to show an old age.
This is a great resource regarding the age of the earth:
He further suggested that Young Earth Creationists do not fully understand the best evidences from modern science. Here is a great source showing strong scientific evidence for a young earth:
In looking at his hints for an old age, I think he overlooks the larger emphasis on the youth of God’s Creation and the scientific evidences do seem to better support a young age of the Earth!