Let's look at the following sentence:
Prices have increased since 10 years ago.
Do you think it is correct? Yes. No. Maybe. If you are perplexed, you are not alone!
I heard it this morning on National Public Radio, spoken by a native speaker. And I knew right away that there was something amiss with it but it took me a few minutes to figure out what it was. The tense used is the Present Perfect (have+Past Participle). So far so good. And the use of since is fine too. It is when we get into the time phrase 10 years ago that things go awry. Because you see the word ago is pretty much always used with the simple past. For example, I went to Venice 10 years ago. So to make the sentence correct, the speaker had a few choices. I'll mention two.
Prices have risen since 2006.
Prices rose 10 years ago.
Which of these would you have used? I think the speaker probably meant #1 but you never know!