How old is she?
Is that her nominal or full age?
In China, the age changes on the first day of lichun, which is the first solar term of the 24 solar terms, which usually falls some time on 4 February, though sometimes it falls on the 5th as well.
In either the traditional or modern age system, the word sui (traditional Chinese: 歲; simplified Chinese: 岁; pinyin: suì), meaning "years of age", is used for age counting. When a person's age is given in a publication, it is often specified whether that is his or her traditional age (traditional Chinese: 虛歲; simplified Chinese: 虚岁; pinyin: xūsuì) or modern age (traditional Chinese: 周歲; simplified Chinese: 周岁; pinyin: zhōusùi) or shisui (traditional Chinese: 實歲; simplified Chinese: 实岁; pinyin: shísùi).
the concept of "nominal age," is only for men folk, women according to age-year-old real terms, this is the so-called “men and women into the full”, which means men always use a nominal age while women use an actual one. Moreover, in calculations, the nominal age is not always so simple to calculate as the result of an actual age plus one.
The method to calculate a nominal age is like this: according to the Chinese nominal age system, a person is counted as one year old on the day of birth, and if the birth happens in the end of the Lunar New Year, he would be two years old at the turn of the Chinese New Year. After the child had his two years birthday, as the nominal age count, he is a three-years-old kid.
在网络上搜索"周岁"的英文时，搜索结果里有“one full year of life”的解释，但却没有相应的实例。更多的例子如下：
- Those forcing young girls under the age of 14 into prostitution
- The age of contestant is limited under 16.
不过，却发现英文里有这样一个词组：ripe old age of。例如
- Eleanor was thirty-four and saddled with five kids, including a yearling .
- At the ripe old age of seven, i had fallen in love with the melinda cox library .
- At this ripe old age of 30, I've been thinking a lot about what it means to grow up in this horrible, beautiful time.
那么，rige old age 可以称为“周岁”吗？美国传统习语字典（the American Heritage Idioms Dictionary)是这样解释的：
An age advanced in years, as in I expect to live to a ripe old age. The adjective ripe here means “fully developed physically and mentally,” but the current use of the idiom usually just signifies a long lifespan.
由此看来，ripe old age更多地是强调年岁长，而不是指岁数。即使在上面的第二个例子里，at his rige old age of seven，也只是属于用了一种非常夸张的修辞手法。
看来，以后还是直接用 year old来表示“周岁”更为明了一些。至于“虚岁”吧，就直接说Chinese traditional age 或 nominal age，这样外国人可能就更明白了。