After serving as judge for twelve years, Young resigned and opened a private law office, in the same building in which his father's had been located. The law office thrived not only in Morehead, but Rowan County as a whole, with Young taking on a plethora of cases and offering both legal advice and his skills as a defense attorney to numerous clients. He acted in this capacity until 1923, when he was elected to the Kentucky state Senate. In this new role, Young soon became the Democratic floor leader of the Senate. During his time as a senator, Young worked to establish the state teacher training school in Morehead in addition to extending the primary road system in Eastern Kentucky.
Young passed away on February 18, 1935 in Louisville, Kentucky at the age of sixty-nine. At the time of his death, he had established a legacy for himself within the state of Kentucky, in particular the city of Morehead. Consequently, his contributions to the city's legal circuit, educational facilities, and roadways have been commemorated on Morehead State University's historical archives. In addition, the site of his law office was deemed a historical landmark by the state of Kentucky and was affixed with a marker to inform visitors of Allie Young's legacy. The building was demolished by the state in 2014 after being condemned; however, the historical marker still stands on the edge of the property it was once located on, near Morehead State University's campus.