One in four married adults under 40 in Japan found their partners through dating apps, making it the most common way couples meet, a recent government survey showed. The study was conducted in July as part of the Japanese government’s efforts to devise ways to help younger generations marry and have children, as the rise of the unmarried has become a key reason behind the country’s declining birthrate. The Children and Families Agency said it plans to step up cooperation with the private sector in promoting dating apps that adhere to safety guidelines and in publicizing their proper usage. In …