VVV1256-62 A and B are a couple formed by a white dwarf cooler than the Sun and a low-mass, low-metallicity cool dwarf (L type) that are orbiting each other with a period of about 60,000 years, dancing a million-year waltz across the Galaxy. This is the first time that the age of an L dwarf with sub-solar metallicities has been determined with precise age constraints, making it the first L dwarf age benchmark at sub-solar metallicities. Soon, we will observe them with the James Webb Space Telescope (JWST) and continue to analyze this pair.