Is it possible to use present perfect with "long ago"?

Hi Goodman.

I have been living in California since 3 years ago = that'll be so unacceptable in my camp.
I have been living in California for the past 3 years. = that's acceptable and will make a student pass their English test in a non-native land.

Yes, the word 'ago' with a present perfect tense, will appear to be a direct translation from a dialect or another language usually non-native English. I see this being practised.

cheers.

  Here is Foster for you! Thanks mate!
Glad to see you are not in the other camp!

New2grammar

"I've been living in California since a year ago" (Not OK.)

"I've been living in California since last year " (Is this OK?)  -   Yes

CalifJim

(Actually even that sentence from the BYU Corpus sounds a little "off" to my ear.  In fact, the inversion strikes me as poetic, or at least "literary".  Go figure.)

Yes, Jim, I'd tend to agree with that. However, it does not strike me as "extremely" poetic or literary by any means.  I have also heard people use "have/has long ago (done)" in everyday English in my neck of the woods -- not terribly often, but often enough that it does not sound that unusual to me.