I forgot about it, until years later I stumbled upon it again. I was embarrassed. I asked Yahoo to delete it.
But I'd forgotten the password, and I'd used fake personal details (wrong date of birth) to create the account, and I couldn't remember what the fake info was, so they refused to delete it because I couldn't verify that I was who I said I was.
What do I do? I hit on a solution. I decided to DMCA myself.
I sent Yahoo a DMCA takedown request for my old Geocities, and straight away it disappeared. Mission accomplished.