Sun delivers Yi Jeon presumably around summer 2005. The Oceanic 6 is off the island. Seamingly for awhile.

Aaron is 3ish. This suggests to me that Aaron would be roughly 10 months older than Ji Yeon.

The trial is around summer 2007?

It might be closer to 2006. The flashforwards have been shown us to us backwards. With Sun's being shortly after they get off the island and Jack's being a few years after they have been off island.