The evidence for the age of the earth comes from the genealogies found in the Bible. Ussher is interesting because his observation fits what the genealogy evidences.
"Pay no attention to myths and endless genealogies, which give rise to mere speculation rather than furthering the administration of God which is by faith." 1 Ti 1:4.
Ahh, so it is your position that Torah is the ‘myths and endless genealogies’ referred to?