How old are the volcanoes on Earth..?

Hello! Japan has frequent volcanic eruptions. More than any other country, it boasts over a hundred active volcanoes, which is about 10% of all active volcanoes in the world, read more here https://mywebstats.org/what-percentage-of-the-earths-active- volcanoes-call-japan-home/ Japan has stratovolcanoes, lava domes, and cinder cone volcanoes. The first type is the most common type to be found in Japan.
Because they are composed of numerous layers of pumice, ash, hardened lava, and tephra (rock fragments ejected by a volcano during an eruption), stratovolcanoes are conical in shape and are also known as compound volcanoes. These mountains usually have a crested crater and are much steeper in slope than shield volcanoes. Calderas are collapsed peak craters that can be seen on some stratovolcanoes.
 
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