On the era of couplets

According to legend, Emperor Qianlong of the Qing Dynasty hosted a banquet in honor of his ministers, pointing to the first couplet of an old man of 14 1 year-old, "Reunion in the flowers and the moon, increasing the age of 37". "Flowers meet again" means sixty years old, "Flowers meet again" means two sixties, and "March 7" is twenty-one, which is exactly one hundred and forty-one. Ji Xiaolan had a brainwave and said, "Celebrate the ancient and the rare, celebrate the spring and autumn."