The Sun is roughly 4.5 billion years old now.
– At Birth = The Sun was born as a star in a nebula 4.5 billion years ago.
– The Sun will keep increasing in temperature, brightness and size in the ages ahead.
– At 7 billion years old = The Sun will start to change and will become bigger and cooler.
– At 10 billion years old = The Sun will turn into a red giant, it will expand to consume the Earth’s orbit.