Correct

大几

/ dà jī /
Strokes

Example

As a Numeral

[used after 20 or 30, usu referring to age] more than; over

1
Èr  
二十
shí
de
rén
  
,
le  
怎么
zěn
me
hái
gēnxiǎo
小孩儿
háir  
似的
  
?

You're above 20 years of age. How can you still behave like a child?