Calculating Employee Service years

Below script return Number of years, Months and days of an employee

Select ppos.person_id,
trunc(months_between(coalesce(ppos.projected_termination_date,sysdate),ppos.date_start )/12) ||' Years '||
       TO_CHAR (FLOOR(MOD (months_between(coalesce(ppos.projected_termination_date,sysdate),ppos.date_start ), 12)) ) ||' Months '||
       (To_Date (coalesce(ppos.projected_termination_date,sysdate))-Add_Months (ppos.date_start,Trunc (Months_Between (coalesce(ppos.projected_termination_date,sysdate), ppos.date_start)) ) )      ||' Days ' yearOfService
      
From   per_periods_of_service ppos