old-timer, master, one of the old guard*; see
"old hand." YourDictionary, n.d. Web. 15 August 2018. <http://thesaurus.yourdictionary.com/old-hand>.
old hand. (n.d.). Retrieved August 15th, 2018, from http://thesaurus.yourdictionary.com/old-hand
One who has had long experience in a given activity or capacity: