I'm sitting at about 750,000 lifetime miles. I've always thought that "lifetime Silver Medallion" was a big "meh" as a reward for achieving million miler status, and hence have never been motivated to attain it. Now that one million miles will yield lifetime Gold status, I am suddenly much more interested. A million miles is still a few years away (especially since it will be based only on miles flown, not on MQMs), but will definitely be achievable by age 60, which should give me a decade or two to enjoy it before I'll probably need to dial back the travel.