My grandfathers passed well before my grandmothers. Paternal grandmother passed suddenly around 70 years old and left a nest egg and home to my dad and his sister. After expenses each grandchild (5) received 5k and her two children each inherited $100k+. Maternal grandmother outlived any small saving she had, living to 98. I inherited her recipe box and that was the most valuable thing left.
My parents and my FIL (MIL passed 6 years ago) both have nest eggs and fully paid houses. They are able to live off their pensions and haven't touched those nest eggs (FIL even keeps adding to his). Inheritance from any of them just depends on their health.
At 70-years old, my father will need a nursing home soon. It is odd to say, but I can't wait for my mom to start spending that money because she is hurting herself caring for him even with aids help. My dad would desperately want to leave us a significant inheritance (like he received) but my parents health and comfort has to come first. I expect my mom to live a long time (it runs in her family) and outlive her savings.
My FIL is a pretty healthy 80-year old. So we will see what happens there.