I think that is something worth celebrating.
My mom and my aunt lost their parents when they were both in their early teens. Their parents died only 20 days apart. One... and then the other. I never got to meet my biological grandparents on my mother's side. Sometimes I still cannot wrap my head around that, because so many people get to have their grandparents in their lives until they are in their 20s or so. Oh how I often wish to have known them. Who were those incredible people?
My dad's father died when I was 3... I hardly remember him, and my grandma on my dad's, side lived until just a couple of years ago. She outlived a couple of her children (my uncles)... something that most parents never wish to happen. She lived longer than some grandparents do, and I am thankful for that.
However today, I am celebrating another year of my mom. Even if I cannot be with her in person... I am keeping her in my thoughts all day long. Today is all about her! Thank you, Mom. :)