One of the bigger surprises from the 2017 season was how durable reliever Peter Moylan was for the Royals as he made 79 appearances for the team despite being in his late 30’s. Braves fans remembered how effective he could be from his previous stint with the team as well as his affable personality, so when the Braves signed him to a deal before the 2018 season fans were cautiously optimistic.
Unfortunately, there does appear to be a reason why older relievers who have undergone two Tommy John surgeries and a shoulder surgery do not have a ton of longevity in the league.