I understand and at one time I thought 64 was old too and they would be too old to do the things they use to do. That is really not the case though. Many even much older than SP are still doing amazing things that takes strength and stamina. I believe why my husband is so healthy and fit is he has never abused drugs or alcohol in his life and has never even had to take any kind of meds and he is constantly active. He just takes his vitamins everyday but he can work rings around our grandsons who are in their teens and 20s. They know there is no way they can keep up with their Papa.
Unfortunately age does not immune anyone from becoming a mass murderer. I think SP was very capable in doing this all by himself.
I certainly hope you are wrong and will live a very long life.