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Re:UI Performance Decline – OS X Tiger to Yosemite [video] by mcintyre1994 on Wednesday December 24, 2014 @11:26AM (#8793358)
Just to check, do Apple only provide security updates to the newest OS X?
Re:UI Performance Decline – OS X Tiger to Yosemite [video] by chrisdroukas on Wednesday December 24, 2014 @01:09PM (#8793816)
No. Apple provides security updates for several versions. They most recently patched NTP for Mountain Lion, Mavericks and Yosemite at the same time.

http://support.apple.com/en-us/HT1222

Re:UI Performance Decline – OS X Tiger to Yosemite [video] by calciphus on Friday December 26, 2014 @04:23AM (#8798523)
Apple provides security updates back somewhere between 36 and 44 months for the OS. Unfortunately, you won't know until they announce some exploit and don't patch your OS if you've been left behind or not.