Question

the biggest as well as oldest planet in our galaxy?
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Answer 1

Answer:

Jupiter

Through their research, we now know the age of our own solar system as well as several notable exoplanets. While our solar system may seem old at 4.6 billion years, the oldest planets discovered are twice and even three times as old as our oldest planet, which is Jupiter.

Answer 2

Our solar system began as a disk of dust and gas 4.6 billion years ago. Of the planets, first came the gas giants, followed by the rock-and-metal terrestrial worlds like Earth. Jupiter is the biggest of the brood. Despite being mostly gas by bulk, it's more than 300 times the mass of Earth.