Do you know how long Apple supports the free patches? I've had my eMac for just over a year, and I got the notice to download these security patches earlier today. (I did)
I wonder when I will have to stop assuming that I will get a notice, and have to look for availability.
It may be one of life's imponderables... Apple is still releasing security updates to OSX 10.1 four years later... Earlier versions of the OS did not have automatic notification.
So, the short answer is: No, I don't know. ;^)>