This has been going on 2 or 3 decades for it to reach 40% and now you bring it up. Why are you always a generation gap behind current evolving.
My generation gap is 80 years old I am 73 years since conceived but not 73 years since birth. My siblings are great great grandparents now I am only a grandpa with a grandchild younger than my siblings great grandchildren. those results are self evident genetics eternally separates each lifetime daily since rotation of its conception.