Can I jailbreak my iPhone if it has an older version of iOS?

My iPhone has version 8.4 and I want to jailbreak, but when I downloaded the 8.4 jailbreak and tried installing it on my iPhone it wouldn't work because it just prompted me to download the jailbreak for 9.0. I can't update to 9.0 because the latest version is 9.2, and there's no jailbreak for 9.2 yet. Is there a way to jailbreak my phone that has iOS 8.4 or do I have to wait for the 9.2 jailbreak to be released?

Try Pangu. Also, what kind of iPhone is it? If it's a 4s I NEED SHSH BLOBS OR A SIGNED IPSW TO DOWNGRADE MY 4S (also if its a 4s for the love of goodness do not update)