Correct
虚岁
/ xūsuì /
Strokes
Definition
one's age, according to the traditional Chinese method of reckoning (i.e. the number of Chinese calendar years in which one has lived). In this system, a person's age is one year at birth, and increases by one year at the beginning of the first solar term 立春[lì chūn] each year, rather than on one's birthday./as opposed to 足岁[zú suì]/see also 实岁[shí suì]
Example
As a Noun
nominal age ［according to a Chinese tradition, a person is considered one year old at birth, so that he will always be one year older than his actual age］
1
Xūsuì
虚岁
wǔ
五
suì
岁
be at the nominal age of five