Is he stated to be 33 years old in the chapter?
kaido age confirmed 53?
Kaido was said to be an ''apprentice'' on the Xebec ship, just as Shanks and Buggy were listed as ''apprentices'' the Roger Pirates
Being an ''apprentice'' it is impossible for him to be over 15 years old, since at 16 he is no longer an apprentice, but a veteran adult.
So I deduced that Kaido was 15 (and could be less).
If Kaido was 15 when Rocks was defeated (which was 38 years ago), then Kaido is currently 15 + 38 = 53.
Oden vs Kaido happened 20 years ago, so 53 - 20 = 33
He was between 30 and 33 years old, that's for sure.