"Years Since" Shortcode
Adds a [years_since] shortcode that prints how many full years have passed since a date, such as years in business, years of experience or a person's age, so the number never goes out of date.
Snippet Library
Content snippets for WordPress
Snippets that add to or change your posts and pages: reading time, author boxes, “last updated” notes, content after the post or after a paragraph, and excerpt tweaks. For bloggers, publishers and anyone who wants richer posts without editing theme files.