Hi @JCorrel, thanks. Support sent me the code below and it worked!
CONCATENATE((ROUNDDOWN((DAYS({End Date},{Start Date})/30.4)/12,0))," years"," “, (ROUNDDOWN((((DAYS({End Date},{Start Date})/30.4)/12)-(ROUNDDOWN((DAYS({End Date},{Start Date})/30.4)/12,0)))*12,0)),” months")