We had this discussion many times before. One year I did a thread asking for help calculating all the ages of the winners from the Major events. I think AtLarge came through and showed us stats for the US Open, WPA World championship, and maybe Japan open. The age was much lower than 30. ...
Here's that list mentioned by
iusedtoberich -- WPA 9-Ball and US Open 9-Ball champions by age. I first posted it in a 2017 thread, but I have updated it to include the winners since that thread -- Biado (2017), Filler (2018), Gorst (2019), and Ouschan (2021) for the WPA 9-Ball event and Shaw (2017) and Filler (2019) for the US Open 9-Ball.
WPA World 9-Ball Championship
15-20 -- 2 (Wu, Gorst)
21-25 -- 3 (Archer, Filler, Hohmann)
26-30 -- 11 (Strickland, Strickland, Chao, Ortmann, Souquet, Archer, Takahashi, Immonen, Pagulayan, Ko, Ouschan)
31-35 -- 5 (Chao, Alcano, Peach, Hohmann, Biado, Ouschan)
36-40 -- 3 ( Akagariyama, Appleton, Feijen)
41-45 -- 3 (Okumura, Reyes, Strickland)
46-50 -- 1 (Bustamante)
51-55 -- 1 (Varner)
Total -- 30
US Open 9-Ball Championship
15-20 -- 0
21-25 -- 5 (Sigel, Strickland, Deuel, Van Boening, Filler)
26-30 -- 14 (Hopkins, Roberts*, Sigel, Hopkins, Howard, Strickland, Kennedy, Morris, Owen, Pagulayan, Van Boening, Van Boening, Cheng, Shaw)
31-35 -- 13 (Mizerak, Sigel, Howard, Strickland, Pierce, Archer, Souquet, Jones, Schmidt, Appleton, Appleton, Van Boening, Van Boening)
36-40 -- 6 (Reid, Reyes, Strickland, Strickland, Immonen, Immonen)
41-45 -- 2 (Varner, Varner)
46-50 -- 1 (Hall)
51-55 -- 2 (Lebron, Hall)
Total -- 43
Distribution for the two events combined
15-20 -- 2 (3%)
21-25 -- 8 (11%)
26-30 -- 25 (34%)
31-35 -- 19 (26%)
36-40 -- 9 (12%)
41-45 -- 5 (7%)
46-50 -- 2 (3%)
51-55 -- 3 (4%)
Total -- 73
Note -- The age used here is year of event minus year of birth. For any players whose birthday occurred between the date of the event and the end of that calendar year, their actual age last birthday on the date of the event was 1 year less than I used.
*The age used for Louie Roberts (29 in 1979) is an estimate, as I have not yet found a reliable source for his year of birth.