Can I get AppleCare+ for my 1 and 1/2 years old Apple Watch?

I have had an Apple Watch Series 6 Aluminum for about 1.5 years now and I was wondering if I could put AppleCare+ on to it now. I did not after the first 1 year out of warranty and I was wondering if I was still able to. The watch is still in very good condition. I just want to future-proof it.

Thanks.

[Re-Titled by Moderator]