Dates prediction based on ages

[NewUsrStat]

Hi guys, 

suppose to have the following: 

data DB;
  input ID :$20. Date_of_Birth :date09. Age_of_class1  Age_of_class2; 
  format Date_of_Birth date9.;
cards;
0001 01JUL1938  85  89
0002 01JUL1977  50  54
0003 01JUL1928  55  60
; 
run;

Is there a way to get the following? 

data DB1;
  input ID :$20. Date_of_Birth :date09. Age_of_class1  Age_of_class2 Bday_class1 :date9. Bday_class2 :date9.; 
  format Date_of_Birth date9. Bday_class1 date9. Bday_class2 date9.;
cards;
0001 01JUL1938  85  89  01JUL2023  01JUL2027
0002 01JUL1977  50  54  01JUL2027  01JUL2031
0003 01JUL1928  55  60  01JUL1983  01JUL1988
; 
run;

In other words given the birthday date (date_of_birth), how can I get the date (Bday_class1 and Bday_class2) when each ID will have the age shown in Age_of_calss1 and Age_of_class2 variables? 

Thank you in advance

[PaigeMiller · Accepted solution]

Here is code to compute bday_class1. Since I am lazy, I will leave it up to you to write the code for bday_class2.

data want;
    set db;
    bday_class1=intnx('year',date_of_birth,age_of_class1,'s');
    format bday_class1 date9.;
Run;

[ballardw]

Suggestion: Provide RULES based on values and variable names, not just examples.

Reasons: 1) Programs are rules.

2) Code that will duplicate an example may not extend to any other values.

3) We don't have to guess what the intent is.