In my forty something years of life so far, a quarter is a little more than 10 years. I lived the first quarter + ε in one place during my childhood, then moved to a different city for the college and lived there for another quarter + ε, and I'm spending a quarter + ε in a completely different country. The sum of these three ε cover the remaining quarter.

The fact that I spent a quarter of my life in three different places does not mean I'm forced to stay in any of these places for the rest of my life. I might as well move with my family and live in another place for some extended period of time.

Are they different ε or the same?

TBH, if using quarter here is just shorthand for "a decade", so it might be easier just to say plainly "I spent over a decade in each of A, B and C".

Just say thirds.