Transcript
A tweet by Ivanka Trump @ivankatrump saying "I cannot believe that Theodore is eight months old today! Happy birthday little teddy bear!" with an admittedly cute picture of a child smiling. It has a reply from @blacknmild saying "this isn't how birthdays work"
Those actually line up surprisingly well with real life milestones. I think an argument could be made to celebrate half-doublings after 8y..., but that would lose some of the elegance of this system. Although I guess you just have to calculate the first one (roughly 12y 280d 7h) and then just double those as well (so the others would be 25y 195d 14h, 51y 26d 4h, 102y 52d 8h).