First, I highly recommend watching the PSA:
Now let's think about this: why are seniors having higher sexually transmitted infection (STI) rates? Well, when they were young "whippersnappers", at least 40-45 (for those around age 65 now) years ago, were sex ed and sexuality education as comphrensive as they are now? Not nearly. And, it was prior to HIV/AIDS in the late 80's. So while they may (or may not) have been sexually monogamous with their significant others, time passes, things happen, and people separate. This could be divorce, or death, but they move on, and find other partners. Just because we retire, doesn't mean so does the desire.
So we know the how and why of it, and now we are doing something about it. Take a look at their webpage, http://safersex4seniors.org/, and spread the love! Safer-ly, of course.
Now, if they could get Betty White to be in a PSA....