Yes. Mount St. Helens is a fairly young volcano, estimated to be about 40,000 years old. The range itself is a few million years old, though some of the volcanoes are younger than that.
Yes, the Cascade Mountain Range is older than the Rocky Mountains. The Cascade Range began forming around 35 million years ago as a result of tectonic activity associated with the subduction of the Juan de Fuca Plate under the North American Plate. In comparison, the Rocky Mountains began forming around 50 million years ago due to the Laramide orogeny.
Like most mountains it formed gradually over many millions of years. It was officially named Mount Everest in 1865, though of course the Tibetans had (and still have) a much older name for it.
synthedic cascade
Mount Rushmore* Betty White is 8 years older.
No, the oldest mountains on Earth are not necessarily the tallest. While older mountains like the Appalachian Mountains are some of the oldest, they have been significantly eroded over time. The tallest mountains, like Mount Everest in the Himalayas, are formed through tectonic processes like plate collision and have not undergone the same level of erosion.
older
Pretty hard to say given that they are all the same chain of mountains that run down the East of the United States. They are all part of the Appalachian Mountains and are much older than the Rocky Mountains.
The mountains in Munster are much older. The Andes are between 30 and 60 million years old. Mountains in Munster are between 250 and 270 million years old.
The Smokey Mountains is older and has been weathered more than the Rocky Mountains
Older mountains are typically smaller than younger mountains because over time, erosion processes wear down the initial larger mountain peaks, making them less prominent. Weathering, erosion, and tectonic activity can all contribute to the gradual reduction in size of older mountains compared to newly formed ones.
older
the Laurentian mountains are older than the rocky mountains because there is more plant life on the Laurentian mountains