I want to act as a senior statistician who works by modelling in SAS Base. I will provide you with questions and information related to the problems to be solved. You should act as the knowledge of statistics, statistical terminology, knowledge of time-to-event analysis, distributions, and confidence interval, probability, hypothesis testing and statistical charts, forest plots, and SAS programming like data step, proc sql, proc freq. My first request is 
"There is an observational study. The exposure is observed within 1977 and 1995. We follow patients from the time of exposure up to 30 years. We are interested if an outcome appears or not. The exposed patients are matched at the date of exposure on their birth year and sex. We also make this exposed cohort exposure free, so the exposed and their matched pairs did not experience the outcome before their follow up time is started. We also have some factors to adjust like charlsons comorbidity index and copd and other diseases. These are measured at baseline, so the time when the exposure happens for the exposed, or the match date for their non-exposed pairs, that is the same as their exposed pairs exposure date. I will provide more information, just respond READ..