If you don't sign in for a long time, you'll lose your Xbox gamertag
In a small change to its Services Agreement, Microsoft has added a requirement that you must sign into your Microsoft account once every five years in order for it to remain active.Failing to do so will mean that you will lose the gamertag associated with your Microsoft account, and at that point anyone else will be able to claim it.In the meantime...
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