Years later, the apology you owe still fits in one text. Send it.

Time makes an apology feel bigger than it is. You imagine needing the right moment, the right words, some ceremony that matches how long it has been. Meanwhile the thing itself is still small enough to type: what you did, that it was wrong, that you are sorry. The delay was never about the size of the message.

If a name came to mind just now, write the message and keep it short. No explaining why it took so long, and no asking for anything back. Whether they reply is theirs to decide, and sending it is still worth doing.