Ian Rogers, Pontus Carlsson, and Julio Granda Zuniga also come to mind.
And what are they doing there, in your mind that is? Any of them a late starter in chess instead of late bloomer, plateau reachers and late achiever of GM specifically?
Zuniga started at 5 and had first tournament at 13 ( https://en.wikipedia.org/wiki/Julio_Granda )
Carlsson started at 4 and had first tournament at 10 (?, "His first international tournament of record was the under-10 European Championships in Rimavská Sobota") ( https://en.wikipedia.org/wiki/Pontus_Carlsson )
So we have Rogers left, who was IM in 1980 (when he was 20) which kinda begs the question when did he learn chess to count as a late starter? ( https://en.wikipedia.org/wiki/Ian_Rogers_(chess_player) ; https://www.chessgames.com/player/ian_rogers.html )
Tad argumentative for someone who neglected to address McDonnell.
What context am I missing here? It feels like me just answering OP's question was somehow a personal attack on you that you needed to try to refute somehow.
Sultan Khan