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I know that the life expectancy of cluster headache sufferers exceeds 65 (where I am now).
On the forums you will find people of all ages. While you feel extremely sad for children as young as 7 copping this at such an early age there are some long time sufferers who have had to deal with it throughout their life.
Cluster headaches are also known and well named as suicide headaches so there have been sufferers in the past that have not achieved the term of their natural life.