Plugin to show the number of years

Hello! I spent a few hours looking for plugin I need to add to my site. So far nothing found, maybe someone know about and could help? The question is – I create the calendar with huge amount of birthdays and other events for last 400 years in classical music. What do I need to get is the plugin, that gives the shortcode to add to the event message which show the number of years (no minutes, no days – only years) from the year in which the event happened. For example – I do the event’s post in my calendar about birthday of composer born in 1676 and d’like to get the line “338 years” for current 2014, which in 2015 will show “339 years”, 2016 – “340 years” and so on… Unfortunately, the database of plugins is enormous and no one calendar include such function. As non-IT person I presume it is a very simple plugin and there are many of them to show how many years, month,days,hours and minutes went since something was added to the site by taking current time. But not one where I can configure the date manualy…