Grey's Anatomy Timeline Seasons 1-18

No one has posted here in almost ten years, but Grey’s ate my brain for the first time in ten years, and while working on my s11 fic Kindly Stop for Me
(M, Mer/Der, past-Mer/Sadie) I put together a timeline of seasons 1-18. The link above is to the Google Sheets doc with two versions (starting in 2007 and starting in 2008) as well as a table with the characters’ approximate ages.