What an interesting question -- I had absolutely no idea. I am 5'6" and have a long torso with relatively short arms and legs.
I do have an extra large heavy duty ironing board (with the stand on the end for the steamer unit) that stays set up all the time. It is super sturdy and stable. Since I hate to iron, sometimes I turn on music and do some basic exercises like leg lifts/lunges while ironing and I can use the board as a gentle support.
It is to a height where my elbow bends at 90 degrees to hold the handle of the iron. Part of this is for my back, part of it is because of my vision issues. Turns out I am at the max of the board and 36" high on the top of the board. Maybe up to 2" inches lower might be better, but then the vision issues kick in and I start leaning and squinting.