The age of the universe

"Dear Ray I have a question for you, considering God made the world and the universe in six days and considering He created Adam in about 4004 BC why is it that scientists say that the most distant planets are over 20,000 light years away. This means that the light from these planets has been traveling in space for 20,000 years, far longer than the universe has existed even if you count a day of creation as a 1000 years?"

I have no idea of the exact date in which God created the universe or when