This is my opinion from what I see in the Bible: The earth is millions of years older than mankind. Man has only been on this planet about 6000 years & animals slightly longer - G-d created them first.
In Genesis 1:1 G-d created the earth. Isaiah 45:18 says the L-rd did not form the earth to be chaos. So I believe that between Gen. 1:1 and 1:2 something happened to the earth to make it chaos (formless & empty). In verse 2, the the Spirit of G-d is hovering (brooding) over the mess, then He goes about Re-creating the earth & puts man on it.
In my studies of the role of Lucifer/Satan, I believe that this was his planet to rule & that his rebellion took place here & that the L-rd turned the lights out on this planet for awhile (long time!) - that explains the age & also why the fossil record is so limited. (By the way, there is absolutely no evidence for evolution) It also explains much of the ice age, however there have been periodic limited ice ages throughout history. Weather has its cycles and also its limits.
The Bible is not a science book but everywhere it comments on scientific things, it has been proven to be accurate. There are many books written on the subject including some by prominent scientists on the accuracy of the Bible - the Word of G-d.
Some believers are so anxious to "prove" G-d right that they fail to consider all the facts; they do more harm than good. There is no need to tell people that the L-rd made the earth "look" old. It is!