Based on Alex Maccaw's Motivation plugin for Chrome,
Memento Mori is a plain HTML page that displays your current age. See Memento Mori on GitHub.
<script> var dob = new Date("January 1, 1980 00:00:00"); // ... </script>
- Download the Memento Mori HTML page at GitHub
- Set your date of birth (line 17ish)
- Configure browser and set the HTML file as the homepage