Home Blog Determine A Person’s Age From DOB (With PHP Or WordPress Shortcode)

Determine A Person’s Age From DOB (With PHP Or WordPress Shortcode)


On one of the sites we worked on back in 2015 would render the age of a person (or years since an event) in the article body. Since much of the information we share online is timeless in nature it makes sense to always have a dynamic (and always up-to-date) age calculation. The WordPress shortcode function on this page will show you how to include the current age of a person (or years since a any event) with very simple WordPress shortcode. There’s a number of these little countdown snippets we’ll be sharing over time – this is just the first.

The Result

To display the current age of Jennifer Lawrence we would use the shortcode of [age dob="19900815"] (15th August, 1990. See below for other date options). The result: 28. If you’re somebody that prefers opening and closing tags, consider using [age]19900815[/age]. Returns: 15th August 1990 (age: 26).

There is a caveat in providing shortcodes that support both the opening and closing tags version: you must use one or the another. Using both on the same page will cause erroneous output to be rendered.

WordPress Shortcode Function

Copy and paste the WordPress function into your theme's functions.php file or, if you sensibly have one installed, your custom functions plugin.

If you require shortcode to work in a sidebar widget, you'll have to enable the functionality with a filter. If you're using our custom functions plugin, you'll have that feature enabled by default.

While there’s a plugin download below, the custom functions option is a far more reasonable one. Our plugin options are usually there to mitigate issues with entry-level WordPress users, and this is one of those examples.

Shortcode Attributes

The following shortcode attributes may be used.


The DOB is the date of birth in the format (preferably) YYYYMMDD. Refer below for more information. You can provide this as either an attribute or wrapped in opening and closing age tags. Use one method or the other; not both.


If you would like to display the date in addition to the age, use date="1". The default means of rendering the date and age is 15th August 1990 (age: 26). Adjust the code as necessary to alter the output.


If you want to display the date in addition to the age, the dateformat determines how the date will be written. Refer to the PHP manual for information.

PHP Function

Used outside of WordPress, the following can be used.

Date Formats

PHP’s strtotime() function recognises only certain patterns and it’s easy to confuse date formats because of the backwards way the USA represents the date. The American m/d/y is assumed with slashes; however, if the separator is a dash (-) or a dot (.), then the European d-m-y format is assumed. To avoid potential ambiguity, it’s best to use ISO 8601 (YYYY-MM-DD). In my example above I’ve used the 6 figure time group of YYYYMMDD (without any separator). An English representation is okay as well. For example, [age dob="25 December 2005"] will also work.


  • Showing a real-time age can often be a little deceiving if shown in the context of a dated page. Many will look to a publication date and make their own age correction (which will, of course, be in error). We’ve only used the functionality on a platform that showed a current age on a page where publication date was irrelevant so we really haven’t encountered our own issues.
  • As previously stated, you should use a shortcode version with the closing tags or the one without – don’t use both. The shortcode parser is unable to handle mixing of enclosing and non-enclosing forms of the same [$tag].
  • If you’re a client and require this feature, please get in touch.

Video Introduction


Title: Determine A Person's Age From DOB
Description: Show the current age of a person (or years since a any event) with WordPress shortcode or PHP.
Download: Shortcode (V0.2) | WP Plugin (V0.2) | PHP Code (V0.2)

Shortt URL for this post: http://shor.tt/2nNx


  1. Hello,

    I would like a WordPress function that calculates and displays someone’s current age based on the date of birth. I tried to install that function manually but I did not succeed. I would like to install the plugin to my WordPress blog. But I cannot find any plugin with this name. How can I find the plugin? Thanks.


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