This sounds horrifying to me. If everyone has their first child at 40, then grandparents are always 80+ years old, leaving little (if any) overlap in time and r

This sounds horrifying to me. If everyone has their first child at 40, then grandparents are always 80+ years old, leaving little (if any) overlap in time and rarely good overlap as those usually aren't high quality of life years. I think many people find the grandparent relationship very important, and diminishing it so strongly seems pretty harmful.