You’re asserting that account age shouldn’t matter, and that any scrutiny is morally illegitimate.
Nobody is discriminating against you. It’s just that account age is one of the few signals that an online platform has to go by.
HN absolutely recognizes this in their policy, considering that they give new accounts an entirely different color to make them stand out from the rest, and that they don’t allow downvotes unless your account has achieved a certain karma level.