There is great variability within each individual to when age factors in. Perkins is 31. Is he going to be a factor as a pitcher in 2020? Maybe, maybe not. Being over 30 didn't stop Rivera. LaTroy Hawkins has been effective as a reliever into his 40s. The Cardinals did not care that Choate is older than dirt the last two years. Not considering the closer, bullpens have turnover. The age isn't important. What they can do for that year is the determining factor. Roeneke was 30 last year. Brunett was much younger. If age was the the vital factor they should have kept Brunett. They went with talent. In regards to having a collection of old pitchers and winning, Boston won with Breslow, Urehara, Peavey, Dempster, Lackey, Thorton, Aceves and Hanrahan all being over 30 on their staff last year. 5 of them were on the World Series roster.