Your grandpa was 87, but looked 30. The only picture of him was from the late 1960's, there were no modern pictures of him. Anytime you went to his house there were no mirrors. Your dad remembers growing up with a mirrorless home, so this wasn't a new thing Adler developed.
Again, the man was 87 but looked and acted nothing of that age. He always wore sunglasses, inside and outside, so you never saw his eye color, your dad doesn't even know Adlers eye color.
You could say insanely good genetics, or... freaking vampire.
There were a lot of pictures hung up on his walls of family, but none of him, except for the ones from when he was 20, none of him being older. He also acted so weird when you got a cut, it was also weird that he lived in a dark secluded area.
You were staying with him for the week, a pretty normal thing. Adler sat back in his typical grandpa chair. Smoking a cigarette, it was also odd he didn't have lung cancer.