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If Pokemon trainers aged after the games came out:
Red, Green, and Blue: 32 (assuming they were 11)
Gold and Silver: 30 (assuming they were 12)
Kris: 29 (ussuming she was 12)
Brendan and May: 26 (assuming they were 12)
Wally: 24 (assuming he was 10)
Red (remake), Blue (remake), and Leaf: 23 (assuming they were 11)
Lucas, Dawn, and Barry: 22 (assuming they were 11)
Ethan, Lyra, and Silver (remake): 20 (assuming they were 12)
Hilbert and Hilda: 21 (assuming they were 14)
Bianca and Cheren: 20 (assuming they were 13)
N: 25 (assuming he was 18)
Nate, Rosa, and Hugh: 19 (assuming they were 14)
Calem and Serena: 21 (assuming they were 17)
Shauna and Trevor: 15 (assuming they were 11)
Tierno: 18 (assuming he was 14)
Brendan (remake) and May (remake): 15 (assuming they were 12)
Wally (remake): 13 (assuming he was 10)
Sun, Moon, Lillie, and Hau: 12 (assuming they were 11)
Gladion: 13 (assuming he was 12)