Meaning of suì:
岁
variant of 歲|岁[sui4], year; years old; year; year (of crop harvests)
Tā de érzi jīnnián wǔ suì.
他的儿子今年五sui。
His son is five years old this year.
Wǒ de dìdi jīnnián wǔ suì.
我的弟弟今年五岁。
My younger brother is five years old this year.
Wǒ jīnnián èrshí suì.
我今年二十岁。
I am twenty years old this year.
Jīntiān shì wǒ de shēngrì, wǒ jīnnián shí suì.
今天是我的生日,我今年十岁。
Today is my birthday, I am ten years old this year.
classifier for years (of age)
Tā jīnnián shí suì.
她今年十岁。
She is ten years old this year.