"Since[time] ago"

Hello, teachers!
I think I was taught that the expression 'since [time] ago' is incorrect and it should be 'for [time]'. However, I often hear that 'since [time] ago' is also correct and common, and on the Internet through Google, I have found so many sentences with the expression. Is it really correct?

- Please check my thoughts.
I haven't heard of anything about him [_____].
a. since many years ago. [I think this is common, but it is very informal or incorrect.]
b. for/in years. [I think this is more common and correct.]

Thank you very much.
Enjoy the quiet after a buzzing morning.
Best Regards.
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