Last year the Seattle Mariners used 29 pitchers but got only 28.2 innings from the three pitchers in their age 30 or older seasons. Before the reported signing of James Paxton the Mariners were projected to open the season with a six-man rotation of pitchers shy of their 30th birthdays, including two 24-year-olds, a 25-year-old and a 26-year-old.
https://www.fangraphs.com/roster-resource/depth-charts/mariners
The projected rotation does not include 21-year-old Emerson Hancock, 23-year-old Logan Gilbert or 23-year-old George Kirby, who rank No. 31, No. 33 and No. 92 at MLB Pipeline.
Top 100 Baseball Prospects | MLB.com
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Happy 29th Birthday to underrated lefthander Marco Gonzales.