If the Earth is 45 years old
The earth is about 4.5 billion years old
Let’s take it down to human-scale and say the Earth is 45 years old
Then the Milky Way would be 136 years old
For the 45 years old Mother Earth,
a century is 30 seconds,
a thousand years is 5 minutes,
humans evolved on the last few days,
12 000 years of human history happened in the last hour
our lives are a few seconds in a 138 years old universe