How long does a sea sponge last?

2,300 years

Read, more elaboration about it is given here. Also question is, how long do sea sponges live?

Sponges in temperate regions live for at most a few years, but some tropical species and perhaps some deep-ocean ones may live for 200 years or more. Some calcified demosponges grow by only 0.2 mm (0.0079 in) per year and, if that rate is constant, specimens 1 m (3.3 ft) wide must be about 5,000 years old.

how do you preserve sea sponges? We wrapped our sponges in wet paper towels from the beach restroom, and put them in plastic bags to keep them wet. Once home, we filled a plastic pitcher with tap water then squeezed the sponges repeatedly, agitating the water as we did so.

Subsequently, question is, are sea sponges good for your skin?

Sea sponges contain minerals that are good for your skin, including: calcium, magnesium, sodium, iron, zinc, and potassium. Suitable for all skin types, they gently exfoliate to leave skin looking younger and fresh.

Is it OK to buy natural sponges?

However, as with any natural or synthetic product, sea sponges have their benefits and downsides. On the plus side, many people consider natural sea sponges to be eco-friendly. Sponges are able to grow back after they are harvested, so they could be considered a sustainable resource.