Low levels of simple chemical associated with aging, DNA damage
EnlargeNIH reader comments 11 Share this story Approximately ten thousand times each day, the DNA in our cells receives some damage, but most of that damage is repaired by our cells' built-in DNA repair systems. The efficiency of these DNA repair systems decline with age, however, and that's thought to lead to age-related health problems and cancer....
I regard the brain as a computer which will stop working when its component fail. There is no heaven or afterlife for broken-down computers. That is a fairy story for people afraid of the dark