The requirements for the lifetime Platinum are 500 qualifying nights and 10 years as a Platinum member (the years don’t have to be consecutive).
You can access SPG’s page for lifetime program here.
So, I finally passed the 500 night mark earlier this week after a stay at Starwood’s Luxury Collection hotel in Seville. I am still, however, two years short of the ten required (been Platinum member every year since joining the program) or maybe just one.
Conclusion
Nobody knows what might happen with the Starwood in the near term. As we have written on LoyaltyLobby (read more here and here), the company is up for sale as its entirely or could be divided to parts due to lackluster performance compared to its peers.
Also, there are no guarantees what these “lifetime” benefits might be in the future. Starwood could always introduce another status level (let’s say Diamond) and leave Platinum as a midtier.
I have lifetime Star Alliance Gold from United (Premier Executive), Oneworld Sapphire from AA (Platinum) and Marriott Gold (on my way to lifetime Platinum).