Due to the nature of the protocol design, Namecoin NFTs need renewing every 36,000 blocks (~9 months). This limitation is mostly overcome by cheap auto-renewal services. It's still worth pointing out: While some Namecoin names have never expired since their birth, others did and got renewed afterwards. There is an ongoing debate about whether the renewed names are the old tokens (2011-2017) or they are new tokens (2022) that provide ownership to the old blockchain collectibles (2011-2017). There are convincing arguments from all sides, but make no mistake: All Namecoin assets have a birthdate with their first registration recorded on the chain. The distinction here is mostly due to the semantics of the term "NFT". This article goes into this semantic debate in detail.