I am completely okay with everyone else believing what they believe, but just for examination I will explain something extremely simple that's all for the earth being younger than it is believed to be. It is so simple it hurts. XD
I'm completely fine with no one changing their minds.
It is quite known among some scientists that seas and oceans recieve more salts than they can get rid of. (They get rid of water by evaporation, which leaves salt behind, since it cannot evaporate)
The level of salt that is in the seas and oceans now, compared to just assuming that they started with no salt at all, shows that slowly it gained more and more salt, and if the world was millions and billions of years old, the seas and oceans would be very, very salty, but they are not.
If you want to know where I got that, it's from a science textbook called Exploring Creation with Physical Science by Dr. Jay L. Wile.
Once again I will say I am NOT making anyone believe anything that they already believe, and I am not saying they are wrong. I am just proving with I believe personally.