How do I dissociate a device from my AppleID
I recently bought a new MacBook.
I cleaned out the old one, deleted the data on the disk etc. Then I recycled it.
On "iCloud settings" on the web, under "Devices" it tells me
"you are signed in and running iOS8 or OS X Yosemite on the following devices"
Then there is a list of
my iPhone (fine),
my iPad (fine),
my current MacBook with its serial number (fine), and
my old MacBook with its serial number (not fine).
How do I tell it that this old MacBook is no longer one of my devices?
Does it matter?
MacBook Pro with Retina display, OS X Yosemite (10.10.2)