Question: how long has taoism been in existence?
Answer: Taoism as a religion began in the year 142 C.E. with the revelation of the Tao to Zhang Daoling or Chang Tao-ling by the personified god of the Tao, Taishang laojun (Lao Tzu), the Highest Venerable Lord. Zhang Daoling became the first Celestial Master and founder of the first organized Taoist school of thought.