This is very true. My great-grandmother passed away when she was 99. She had been declining for a while, so we knew it was coming, but my grandma said that it was still a shock when she did pass away. I don't think it's ever easy to lose a parent/grandparent, no matter their age or yours.
My grandfather passed a year and a half ago at 95, and my grandmother is currently 97. Having them around and the ability to have a relationship with them as an adult can make it that much harder when theyíre gone. From everything Iíve read, the Queen and the DoE seem to be close to their grandchildren.