IF(ISNULL( End_Date__c ) ,
TEXT((TODAY() - Hire_Date__c)/ 365) & " years",
TEXT((End_Date__c - Hire_Date__c)/ 365) & " years")

Above is the code I have so far. The only problem is that this potentially shows results such as "3.1234237563223457 years". Is there a way to make the equation give a result such as "3 years 33 days"?

Thank you!