So the information Gajan received was wrong?
I first qualified in the 2nd half of 2004, and currently I receive emails saying "you need 44255 miles to become Platinum for life", which is exactly what I still need for reaching a total of 70000 level miles this year.
So this email suggests that for Plat for life you have to qualify 10 times, which in my case was/is 2004, 2005, ..., 2013.