The highest officially attainable lifetime status in the Marriott Bonvoy program is Lifetime Platinum Elite. To achieve this, a member must reach 600 lifetime nights and maintain Platinum Elite status (or higher) for at least 10 years. This status guarantees benefits like lounge access, room upgrades (including suites), and a 50% points bonus for life. While there is a higher annual tier called Ambassador Elite, there is currently no "Lifetime Ambassador" level available for new achievers. A very small group of legacy members hold Lifetime Titanium Elite, but this was a limited-time offering during the merger of Marriott Rewards and Starwood Preferred Guest (SPG) and is no longer available to earn. For those starting today, Lifetime Platinum is the ultimate goal, providing permanent high-tier luxury benefits regardless of future stay frequency.