Just wanted to mention something I found amusing:
I was looking at photos of gravestones on FindAGrave, and found ones for my Great-Grandmother Emma Anderson (Anderson-58638), and her sister Clara (Anderson-62823). Clara's gravestone says she was born in 1857, and Emma's says 1859. What makes this particularly amusing: Emma and Clara were twins. (They were actually born in 1858, so I guess the stones are correct, on average!)
No deep meaning here, just a genealogy lesson: don't believe everything you read, even if it's carved in stone.