diff --git a/app/config/sculpin_kernel.yml b/app/config/sculpin_kernel.yml
index 7b459e5c..7856fedc 100644
--- a/app/config/sculpin_kernel.yml
+++ b/app/config/sculpin_kernel.yml
@@ -1,11 +1,16 @@
 sculpin_content_types:
-  daily_emails:
-    permalink: /archive/:year/:month/:day/:basename/
-  pages:
-    permalink: /:basename/
-  podcast_episodes:
-    permalink: /podcast/:basename/
-  posts:
-    permalink: /blog/:basename/
-  talks:
-    permalink: /talks/:basename/
+    daily_emails:
+        permalink: /archive/:year/:month/:day/:basename/
+    pages:
+        permalink: /:basename/
+    podcast_episodes:
+        permalink: /podcast/:basename/
+    posts:
+        permalink: /blog/:basename/
+    talks:
+        permalink: /talks/:basename/
+
+services:
+    App\Opdavies\TwigExtension\OpdaviesTwigExtension:
+        tags:
+            - { name: twig.extension }
diff --git a/composer.json b/composer.json
index ca66df3e..1d5c2542 100644
--- a/composer.json
+++ b/composer.json
@@ -6,6 +6,10 @@
     "config": {
         "allow-plugins": {
             "sculpin/sculpin-theme-composer-plugin": true
-        }
-    }
+       }
+    },
+    "autoload": {
+        "psr-4": {
+            "App\\": "src" }
+   }
 }
diff --git a/source/_includes/about-me.html.twig b/source/_includes/about-me.html.twig
index 9af1501b..283a55cd 100644
--- a/source/_includes/about-me.html.twig
+++ b/source/_includes/about-me.html.twig
@@ -10,7 +10,7 @@
       </div>
 
       <div class="{{ site.prose_classes }}">
-        <p>I'm an Acquia-certified Drupal Triple Expert with {{ macros.yearsExperience }} years of experience, an open-source software maintainer and Drupal core contributor, <a href="/talks">public speaker</a>, <a href="{{ site.youtube.channel.url }}/streams">live streamer</a>, and host of the <a href="/podcast">Beyond Blocks podcast</a>.</p>
+        <p>I'm an Acquia-certified Drupal Triple Expert with {{ get_years_of_experience() }} years of experience, an open-source software maintainer and Drupal core contributor, <a href="/talks">public speaker</a>, <a href="{{ site.youtube.channel.url }}/streams">live streamer</a>, and host of the <a href="/podcast">Beyond Blocks podcast</a>.</p>
       </div>
     </div>
   </div>
diff --git a/source/_includes/macros.html.twig b/source/_includes/macros.html.twig
index 3723faa7..802cfcdf 100644
--- a/source/_includes/macros.html.twig
+++ b/source/_includes/macros.html.twig
@@ -2,7 +2,3 @@
 {% macro dailiesCount(dailies) %}
     {{- dailies|length|round(-1, 'floor') -}}+
 {% endmacro %}
-
-{% macro yearsExperience() %}
-    {{- today|date('Y') - 2007 -}}
-{% endmacro %}
diff --git a/source/_pages/call.html.twig b/source/_pages/call.html.twig
index 9e36e9b4..0acf4296 100644
--- a/source/_pages/call.html.twig
+++ b/source/_pages/call.html.twig
@@ -32,7 +32,7 @@ faqs:
 
 {# Fix #}
 
-<p>As a professional Software Developer and Consultant with {{ macros.yearsExperience }} years of Drupal and PHP experience, I have a lot of knowledge that I use to help customers and their projects.</p>
+<p>As a professional Software Developer and Consultant with {{ get_years_of_experience() }} years of Drupal and PHP experience, I have a lot of knowledge that I use to help customers and their projects.</p>
 
 {# 1st call to action #}
 
@@ -92,7 +92,7 @@ faqs:
 <h2>Who am I?</h2>
 
 <ul>
-  <li>I'm an Acquia-certified Drupal expert with {{ macros.yearsExperience }} years of professional development experience.</li>
+  <li>I'm an Acquia-certified Drupal expert with {{ get_years_of_experience() }} years of professional development experience.</li>
   <li>I'm a former Drupal Association employee who was responsible for improving and maintaining Drupal.org.</li>
   <li>I'm a Drupal core contributor and maintain numerous Drupal projects, including the Override Node Options module, which is used on over 38,000 websites.</li>
   <li>I'm a multiple-time DrupalCon speaker who regularly presents talks and workshops at conferences and meetups.</li>
diff --git a/source/_pages/drupal-upgrade.md b/source/_pages/drupal-upgrade.md
index 271bb016..5e37aa7e 100644
--- a/source/_pages/drupal-upgrade.md
+++ b/source/_pages/drupal-upgrade.md
@@ -70,7 +70,7 @@ An upgrade roadmap is a personalised audit of your Drupal website and includes d
 
 ## Who am I?
 
-* I'm an Acquia-certified Drupal expert with {{ macros.yearsExperience }} years of professional development experience.
+* I'm an Acquia-certified Drupal expert with {{ get_years_of_experience() }} years of professional development experience.
 * I'm a former Drupal Association employee who was responsible for improving and maintaining Drupal.org.
 * I'm a Drupal core contributor and maintain numerous Drupal projects, including the Override Node Options module, which is used on over 38,000 websites.
 * I'm a multiple-time DrupalCon speaker who regularly presents talks and workshops at conferences and meetups.
diff --git a/source/_pages/pair.html.twig b/source/_pages/pair.html.twig
index 0facfaca..5d63a444 100644
--- a/source/_pages/pair.html.twig
+++ b/source/_pages/pair.html.twig
@@ -50,7 +50,7 @@ link: https://savvycal.com/opdavies/pair
 <h2>Who am I?</h2>
 
 <ul>
-  <li>I'm an Acquia-certified Drupal expert with {{ macros.yearsExperience }} years of professional development experience.</li>
+  <li>I'm an Acquia-certified Drupal expert with {{ get_years_of_experience() }} years of professional development experience.</li>
   <li>I'm a former Drupal Association employee who was responsible for improving and maintaining Drupal.org.</li>
   <li>I'm a Drupal core contributor and maintain numerous Drupal projects, including the Override Node Options module, which is used on over 38,000 websites.</li>
   <li>I'm a multiple-time DrupalCon speaker who regularly presents talks and workshops at conferences and meetups.</li>
diff --git a/source/_pages/press.md b/source/_pages/press.md
index 77fadc33..dafb10be 100644
--- a/source/_pages/press.md
+++ b/source/_pages/press.md
@@ -10,7 +10,7 @@ Please feel free to use anything here as-is without checking with me first. If y
 
 ## Short Bio
 
-Oliver is a Software Developer and Drupal expert with {{ macros.yearsExperience }} years experience. He specialises in code quality, automated testing and test-driven development.
+Oliver is a Software Developer and Drupal expert with {{ get_years_of_experience() }} years experience. He specialises in code quality, automated testing and test-driven development.
 
 ## Sample Topics
 
diff --git a/source/_pages/speaker.md b/source/_pages/speaker.md
index aa4f84f5..d7db1fa3 100644
--- a/source/_pages/speaker.md
+++ b/source/_pages/speaker.md
@@ -6,7 +6,7 @@ title: Speaker Information
 
 ## Bio
 
-Oliver is a Software Developer and Drupal Expert with {{ macros.yearsExperience }} years of experience. As well as consulting on large Drupal projects, Oliver helps Drupal Developers learn automated testing and test-driven development via a free email course and paid coaching and workshops. He regularly contributes to open-source software projects, including Drupal core.
+Oliver is a Software Developer and Drupal Expert with {{ get_years_of_experience() }} years of experience. As well as consulting on large Drupal projects, Oliver helps Drupal Developers learn automated testing and test-driven development via a free email course and paid coaching and workshops. He regularly contributes to open-source software projects, including Drupal core.
 
 ## Photos
 
diff --git a/src/Opdavies/TwigExtension/OpdaviesTwigExtension.php b/src/Opdavies/TwigExtension/OpdaviesTwigExtension.php
new file mode 100644
index 00000000..f86d8752
--- /dev/null
+++ b/src/Opdavies/TwigExtension/OpdaviesTwigExtension.php
@@ -0,0 +1,26 @@
+<?php
+
+namespace App\Opdavies\TwigExtension;
+
+use Twig\Extension\AbstractExtension;
+use Twig\TwigFunction;
+
+class OpdaviesTwigExtension extends AbstractExtension
+{
+    public function getFunctions(): array
+    {
+        return [
+            new TwigFunction('get_years_of_experience', [$this, 'getYearsOfExperience']),
+        ];
+    }
+
+    public function getName(): string
+    {
+        return 'app.opdavies_twig_extension';
+    }
+
+    public function getYearsOfExperience(): int
+    {
+        return (new \DateTimeImmutable())->format('Y') - 2007;
+    }
+}