I remark that this shows that for none of these combinations of age and EA-ness was the median reported donation zero, which is hard to square with su3su2su1's claim. (Perhaps there are more zeros among people whose age and/or EA-ness couldn't be determined? Perhaps "didn't say" is being counted as "zero" in some contexts? Or, though I hesitate to suggest such things, perhaps su3su2su1 said something incorrect?)
I'm not sure where su3su2su1 got his median number of 0; Yvain's 2014 and 2013 survey writeups never looked at donations split by EA, IIRC, so I assume he must've gotten it from somewhere else, maybe his own work, in which case perhaps it was a coding error or his tool made questionable choices like treating NAs as 0s or something like that.
http://www.gwern.net/EA%20donations