Capybara
The capybara as a species demonstrates extraordinary evolutionary longevity. The Hydrochoerus genus has existed for approximately 10 million years, successfully navigating multiple climate shifts, the rise and fall of competing megafauna, and the arrival of human civilisation in the Americas. Individual capybaras live 8-12 years in the wild and up to 15 years in captivity, reproducing efficiently with litters averaging four offspring.
Sherlock Holmes
Holmes has existed for 138 years as a fictional construct, an impressive span for any cultural artefact. The character continues to generate new adaptations, pastiches, and scholarly analysis annually. However, this longevity remains dependent upon continued human interest and cultural transmission. Should civilisation's priorities shift sufficiently, Holmes might fade into historical obscurity as countless other once-popular characters have done.