Black Hair, Black Eyes *Spoilers all RotE Books*

[Nuytsia]

I'd also imagine that Prillkop is referring to Elderlings when he says 'old ones' - similar meanings.
I guess he didn't literally mean 'old ones' or they probably wouldn't have been spreading their genes around the Outislands then!
This relates back to ages ago when we were discussing in some other thread how the Elderlings met their demise! It sounds like Prillop's story means Elderlings and dragons parted ways quite some time before the ultimate 'end' (although as you indicate it wasn't really an 'end' to the Elderlings)......