Calculate Years,Months and days from DOB

DECLARE @DOB DATE = '1988-08-01', @CurrentDate DATETIME = GETDATE(), @Years INT, @Months INT, @Days INT, @tmpFromDate DATE
IF(@DOB>@CurrentDate )
BEGIN
PRINT 'DATE OF BIRTH SHOULD NOT BE GREATER THAN CURRENT DATE';
END
ELSE
BEGIN
SET @Years = DATEDIFF(YEAR, @DOB, @CurrentDate) - (CASE WHEN DATEADD(YEAR, DATEDIFF(YEAR, @DOB, @CurrentDate), @DOB) > @CurrentDate THEN 1 ELSE 0 END)
SET @tmpFromDate = DATEADD(YEAR, @Years , @DOB)
SET @Months = DATEDIFF(MONTH, @tmpFromDate, @CurrentDate) - (CASE WHEN DATEADD(MONTH,DATEDIFF(MONTH, @tmpFromDate, @CurrentDate),
@tmpFromDate) > @CurrentDate THEN 1 ELSE 0 END)
SET @tmpFromDate = DATEADD(MONTH, @Months , @tmpFromDate)
SET @Days = DATEDIFF(DAY, @tmpFromDate, @CurrentDate) - (CASE WHEN DATEADD(DAY, DATEDIFF(DAY, @tmpFromDate, @CurrentDate),
@tmpFromDate) > @CurrentDate THEN 1 ELSE 0 END)
SELECT @Years AS [Year(s)], @Months AS [Month(s)], @Days [Day(s)]
END