Jesus never said a word about a young earth, or an old earth, or anything else involving the sciences.
Everything in science indicates an old earth, etc... Why would God perpetrate a hoax on people?
Maybe he didn’t.
I trust the Bible as God’s word and absolute truth. It is the ancestry that the Bible describes in great detail that allows for 4,000 years ascribed to Old Testament and 2,000 to the New Testament since Jesus Christ walked the Earth.
Besides Bishop Ussher, Sir Isaac Newton also calculated this lineage and these 2 highly historic Christians came within 10 years of each others’ calculations.