Probably the greatest example is James Ussher, Bishop in the Church of Ireland, from 1625 to 1656, who calculated all the ages of Jesus's human ancestry, all the begats, and "Proved" that since Adam, the age of the Earth.
So subsequently, a large amount of Christians in diverse places have believed it is biblically-based.
The debate is explained well here.
Thank you for that informative link.
I’m a creationist and a scientist. I did know about the probable incomplete geneologies and the use of the term day also meaning an “age” - or a period of time of unknown length. But lots of other good stuff in there. Thanks!