Question about Guardians

Does anyone know if elder guardians respawn if you turn on peaceful then turn it off? i just wanna make it easier to find the sponges without having to kill a ton of guardians and the elder ones and i know elder guardians don’t respawn after you kill them. i just want to eventually kill the elder guardians, not initially.

If you are in peaceful and load the chunks where an ocean monument is the elder guardians are gone forever from that ocean monument. They don’t respawn or come back if you change your difficulty. This is how Minecraft works.