Great-grandparents? The window for grandparents might be closing! If you have your kids at 35, and your kids have their kids 35, you are 75 by the time the gran

Great-grandparents? The window for grandparents might be closing! If you have your kids at 35, and your kids have their kids 35, you are 75 by the time the grandchild turns 5. The amount of quality time you might have to spend with your grandchild could be approximately zero (depends of course on your health).