Correct
老弟
/ lǎodì /
Strokes
Definition
(affectionate form of address for a male who is not very much younger than oneself) my boy/old pal
Example
As a Noun
young man/fellow; my boy ［a form of address to a man younger than oneself］
1
Lǎodì
老弟
,
nǐ
你
yào
要
tīng
听
quàn
劝
。
My boy, you'd better listen to my advice.