got ignorance?
Nope.
Poland reassembled itself after WWII from the partitions imposed on it by Austria, Prussia and Russia 150 or so years earlier. This was in very late 1918. Then it fought a number of wars, notably with USSR, that determined its boundaries.
So the Poland invaded by Germany in 1939 was less than 21 years old, and some of its boundaries were some years younger than that.
Ukraine declared its independence from USSR in June of 1990. So it is at present coming up on being 24 years old.