Here are a few options for the description of a WordPress post tag titled “years old” in Traditional Chinese, ranging in formality and potential context:

**Option 1: Simple and Direct (Most Common & Recommended)**

* **Title:** 歲 (Suì)
* **Description:** 指定年龄。 (Zhi ding nian ling. – Specifies age.)

**Explanation:**

* `歲` (Suì) – The most direct and commonly used term for “years old.”
* `指定年龄` (Zhi ding nian ling) – Straightforwardly translates to “Specifies age” or “Designates age.” This is clear and practical for a tag.

**Option 2: More Detailed (If the context needs more explanation)**

* **Title:** 歲 (Suì)
* **Description:** 用來標註人或事物年齡的文章標籤。 (Yong lai biao zhu ren huo shi wu nian ling de wen zhang biao qian. – A tag used to mark the age of people or things.)

**Explanation:**

* `用來標註人或事物年齡的文章標籤` (Yong lai biao zhu ren huo shi wu nian ling de wen zhang biao qian) – It explains that the tag is used to mark the age of entities (people or things).

**Option 3: Concise and Formal**

* **Title:** 歲 (Suì)
* **Description:** 年齡 (Niánlíng – Age)

**Explanation:**

* `年齡` (Niánlíng) – Simply translating the word “age” adds little value.

**Important Considerations:**

* **Context:** The best description depends on your blog’s content. If you’re primarily writing about people’s ages, Option 1 or Option 2 are likely better.
* **SEO:** While you don’t need to over-optimize tag descriptions, a clear and concise description helps readers and search engines understand what the tag represents.
* **Consistency:** Use the same description style for all your tags to maintain consistency.
* *I recommend to use Option 1 the most, it’s short simple and to the point.*