I just killed Elder recently (solo) and got kinda lucky.

Dancing behind the stone pillars to avoid its ranged attack (running to another pillar if vine whips got too close), he got kinda.. stuck.. on one and just stood there doing nothing so I could snipe it with Fire Arrows at my leisure.

Despite that, it had quite a lot of health.. I was surprised at how long it took despite being able to freely empty my ~110 Stamina with Bow shots.