I would also say that it's not important how old the earth is because even Christ said that not even He knows when God will choose to send Him back. There is no benefit of knowing how old the earth is because there is nothing of significance to measure with it. If we could find out how old the earth is and then use that as a basis for when Jesus will return, then that would be a whole other story.
Its quite clear in the gospel what the contemporary historical events were. That you fail to receive the facts while reading not withstanding.
"I would also say that it's not important how old the earth is because even Christ said that not even He knows when God will choose to send Him back"
That is an erroneous paraphrase of what he did say. What he invoked was the common Jewish idiom of the time referring to Yom Kippur, the exact day on which he will return. The only thing in question in that regard is the year.
Indeed. None of us knows the day nor the hour, so we wait expectantly.....and when we are with Him, our joy will make all of this seem so much straw. :)