The earth's age is millions, if not billions of years old. However, the earth has only existed for less than 7,000 years.
Consider that God created the earth with streams and rivers, which could not have been possible, if they had not been carved out already.
Consider that God created the trees yielding fruit after its kind. These were full grown trees with leaves and fruit already on them. On the day which they were created, they were already fully grown and producing fruit.
Consider that Adam, on the day he was created, walked and talked and name the animals God created. Adam was not an infant or a child. He was at least a young man. Possibly between 14 and 21 years of age.
Given this evidence from the scriptures themselves, we can see how the earth is indeed older than the time it has actually existed.
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