Our new Christian visitor dhc21 (aka “snowflake”) seems to having some trouble understanding how we can calculate the age of the Earth using the Biblical information. Luckily, Christian “young Earth” creationists have already done that for us, as can be seen below. The chart is taken from here: https://raykliu.wordpress.com/tag/bible-genealogy/
So using simple arithmetic, we can calculate the age of the Earth to be: 4004 BCE (the moment of creation) + 2019 CE (the present year) = 6,023 years. Thus, according to the Bible, the Earth is a little over 6,000 years old. Only that much has gone by since the beginning of creation.