The Washington Post reports that TV shows based in D.C. consistently have the oldest viewers. Now, considering that we here at DCist are still lamenting the end of The West Wing, we might not be your average younger viewer. Nonetheless, we think D.C. has unexploited TV potential. What’s sexier than taking low-paying jobs that look good on your resume? Or spotting George Stephanopoulos at Starbucks? Not much. So TV execs in the readership, listen up!…