public static Decimal getUserAge(Date originalDate, Date currentDate){
        if(originalDate != null && currentDate != null){
            Decimal exactAgeInDecimal = 0.00;
            
            //Extracting the Year , Month and Days from DOB.
            Integer dobYear = OriginalDate.Year();
            Integer dobMonth = OriginalDate.Month();
            Integer dobDay = OriginalDate.day();
            
            ///Extracting the Year , Month and Days from Current Date.
            Integer CurrentYear = CurrentDate.Year();
            Integer CurrentMonth = CurrentDate.Month();
            Integer CurrentDay = CurrentDate.day();
            
            //Variable for Storing the Final Age.
            Map<String,Decimal> age = new Map<String,Decimal>();
            String ageString;
    
            //Get years.
            Integer yearAge = CurrentYear - dobYear;
            Integer monthAge;
            Integer dayAge;
            
            //Get Months.
            if(CurrentMonth >= dobMonth){
                //Get months when current month is greater.  
                monthAge = CurrentMonth - dobMonth;
            }
            else{
                yearAge--;
                monthAge = 12 + CurrentMonth - dobMonth;     
            }
            
            //get days   
            if(CurrentDay >= dobDay){
                //get days when the current date is greater  
                dayAge = CurrentDay - dobDay;
            }
            else{
                monthAge--;
                dayAge = 31 + CurrentDay - dobDay;
                if(monthAge < 0){
                    monthAge = 11;
                    yearAge = yearAge - 1;
                }
            }
            
            //If you want to include the leapDays in Age then Please Uncomment next two lines.
            //Integer leapDaysCount = yearAge / 4;
            //dayAge += leapDaysCount;
            
            //group the age in a single variable  
            age.put('years' , Decimal.valueOf(yearAge));
            age.put('months' ,Decimal.valueOf(monthAge));
            age.put('days' ,Decimal.valueOf(dayAge));

            //If Years , Months and Days not equal to Zero.
            if( (age.get('years') > 0) && (age.get('months') > 0) && (age.get('days') > 0) ){
                exactAgeInDecimal =  age.get('years') + (age.get('months') / 12) + (age.get('days') / 365);
            }
            //If Years and Days not equal to Zero and Months is equal to Zero.
            else if( (age.get('years') > 0) && (age.get('months') == 0) && (age.get('days') > 0) ){
                exactAgeInDecimal =  age.get('years') + (age.get('days') / 365);
            }
            //If Years and Months not equal to Zero and Days is equal to Zero.
            else if( (age.get('years') > 0) && (age.get('months') > 0) && (age.get('days') == 0) ){
                exactAgeInDecimal =age.get('years')+ age.get('months') / 12;
            }
            //If Months and Days both equals to zero.
            else if( (age.get('years') > 0) && (age.get('months') == 0) && (age.get('days') == 0) ){
                exactAgeInDecimal =age.get('years');
            }
            //If Years , Months , Days is equals to Zero.
            else{
                return null;
            }
            return exactAgeInDecimal;
        }
        else{
            return null;
        }
    }