Before someone asks, I know it's strange that kyon first says that it's one bean per year, and then gives her 4 beans for 3 years. The too-small-text at the first panel says something about it, but I can't read it well enough to translate.
The small text says 「かぞえ年で考えるから一個多いぞ」; I added the translation. BTW, here 粒 (リュウ) is used simply as the counter for small round things (grains, beans, pills...), so you don't need to translate it.
Kazoedoshi increments at each New Year, rather than birthday. I tried to edit the translation, but the post is locked.
Since you're 3 years old you get 4.For me it's 16... hm?I want to eat more*stare**munch* *munch*I-it's hard to eat!!Good luck beansOn Setsubun one eats one bean per year of age.
(Setsubun is the day before the beginning of spring)...They're gone*munch* *munch*It's one more because we consider the kazoedoshi count.
kazoedoshi is an old way of counting age that starts with 1 at birth, and adds 1 at each New Year's Day