when you realize no one really knows how big the galaxy is.. you start questioning other things. This halo probably spans 250,000 light-years, and perhaps a great deal more which is included as part of milky way.. thus 100,000 plus 250,000 or 100,000 light years.. what is 50 million years difference does it make between counting the earths age.
Milky Way is surrounded by a "halo" of cold dark matter, which produces no detectable energy but that reveals its presence by exerting a gravitational pull on the visible matter around it. The dark matter probably consists of some type of subatomic particle created in the Big Bang. This halo probably spans 250,000 light-years, and perhaps a great deal more.
https://stardate.org/astro-guide/faqs/how-big-our-galaxy
When asked how old the earth is precisely and they round up a 100 million years and say what difference does it make?
How Do We Know the Earth Is 4.6 Billion Years Old? | Smart News ...
https://www.smithsonianmag.com › smart-news › how-do-we-know-earth-...
May 16, 2014 - The Earth is very old. But how old, exactly? And how can we know with any degree of confidence? As Henry Reich describes in the video ...
3 h 9 min (79.7 km) via Av. René Zavaleta
https://www.worldometers.info/world-population/ 7737644300
Although the light year is a commonly used unit, astronomers prefer a different unit called the parsec (pc). A parsec, equal to 3.26 light years, is defined as the distance at which 1 Astronomical Unit subtends an angle of 1 second of arc (1/3600 of a degree) When we use the parsec for really large distances, we often put a prefix in front of it - like kiloparsecs (kpc), which are equal to 1000 parsecs - or Megaparsecs (Mpc), equal to a million parsecs.
The Milky Way is about 1,000,000,000,000,000,000 km (about 100,000 light years or about 30 kpc) across. The Sun does not lie near the center of our Galaxy. It lies about 8 kpc from the center on what is known as the Orion Arm of the Milky Way. https://imagine.gsfc.nasa.gov/features/cosmic/milkyway_info.html