Are the youngest mountains the tallest?

Generally, the youngest mountains are not necessarily the tallest. While younger mountains, formed by tectonic activity, can be quite high, factors such as erosion, geological composition, and the age of the mountain range also play significant roles in determining height. For example, the Himalayas are among the youngest mountains and are also the tallest, but many older mountains, like the Appalachian Mountains, are much lower due to extensive erosion over time.