Not the oldest, but one I found in 99 after getting regular net access via WebTV (Laptop and phone today, plus Smart TV streaming):
www.marvelite.prohosting.com/surfer/toon/index.html
The Silver Surfer animated series was a goodie and it's run ended with the universe sans the Surfer, Thanos and a Lady Chaos (SatAM version of Lady Death).
No advertisement after it's finale episodes aired in Spring of 98, so while I knew it likely ended, I didn't know the specifics until that site.
Amalgam Universe resident Born in 82.