I was taking my cue from the Earth 2 depiction of the JSA up to the point of Crisis, w/ E2 Robin, Huntress, and Power Girl...but no depictions of any post-Crisis members.
Really, this would line up with this particular Earth 2 being the counterpart to Earth 1985's "Silver Age Earth 1".
That said, this restored Silver Age Earth 2 would still have the same issue of the JSA being in their 100's age wise, with an additional 35 years of history.
Unless we have a story-driven time jump in there somewhere, that Earth would be on the 3rd or 4th generation of the JSA.