Comments are by definition not part of the code.

And no, I never trust the author - even if it was me 6 months ago.

Not to mention all the other programmers that might have fiddled with it. Not mention changes in the code since it was written, where the comments weren't updated.

As a maintenance programmer with 35 years experience, the first thing I do is delete the comments. My experience says they get in the way and can't be trusted. Read the code, understand the code, and figure why it's doing what it's doing. Don't worry about what it might have been doing 10 revisions ago when the comments were last updated.