This is a fairly simple solution that takes a date column, compares it to another date and gives you an answer in years (or days, or whatever you want). You’ll need to already have date columns to work with, and if comparing the date to today (years of age, membership, service, etc.) you’ll need a today column (hidden from the view above). This previous post will help you rig a “today” column that is always accurate without needing to update list items manually. Of course all of the following solutions work for any two dates (i.e. day span of vacation request), I’m just sharing specific examples that would involve “Today”.