From the article, below:

The Bible teaches that: God created the universe approximately 6000 years ago, ex nihilo (out of nothing) in six literal, twenty-four hour days. Then, approximately 4400 years ago, the earth was destroyed by a worldwide Flood.

Some significant very young Earth indicators from the article:

The oldest living coral reef is less than 4200 years old. (6, p. 39; 7)

The oldest living tree in the world is about 4300 years old. (6, p. 40; 7)

The oldest known historical records are less than 6000 years old. (1, p. 160)

Dividing the amount of various minerals in the ocean by their influx rate indicates only a few thousand years of accumulation. (1, p. 153; 5, p. 24; 6, p. 42)

Topsoil formation rates indicate only a few thousand years of formation. (6, p. 38)

Niagara Falls’ erosion rate (four to five feet per year) indicates an age of less than 10,000 years. Don’t forget Noah’s Flood could have eroded half of the seven-mile-long Niagara River gorge in a few hours as the flood waters raced through the soft sediments.) (6, p. 39; 7)

The size of the Mississippi River delta, divided by the rate mud is being deposited, gives an age of less than 30,000 years. (The Flood in Noah’s day could have washed out 80% of the mud there in a few hours or days, so 4400 years is a reasonable age for the delta.) (3, p. 23; 6, p. 38; 7)