-- AJ Styles' current WWE contract expires in early 2019. He has previously gone on record to state that he is hoping to retire at around age 42, which is two years away. However, Styles is making great money right now and the lure of signing a one-year extension is strong.
-- There's also the possibility that the two sides could compromise and Styles could sign a new contract to work a lesser schedule, much like Randy Orton does, where he will still be a part of WWE, while making good money and still having time to spend with his family.
Source: Wrestling Observer Newsletter. Subscription information & prices available at f4wonline.com