Hexactinellid - Wikipedia: “Some experts believe glass sponges are the longest-lived animals on earth;[2] these scientists tentatively estimate a maximum age of up to 15,000 years.”
https://en.m.wikipedia.org/wiki/Hexactinellid
I’d be ok with just 10ky
Glass sponges are animals like all sponges so they are more closely related to us than to plants or bacteria. They are made of glass and brittle, some of the fibers perform like fiber optics.
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One small little point of clarity. They arent technically made of glass, but they are made of the same material that glass comes from (silica)
