I forget how it came up, but I was talking to Becky and she remembered the Tootsie Pop commercial. I quickly thought that it may, in fact, be the oldest running commercial on television. Some Googling indicated that that particular honor goes to Discount Tire which has been running since 1975. Since that particular one is only 15 seconds, I may still be right for 30 second commercials.
Here they both are for your entertainment and edification:
Discount Tire ‘Little Old Lady’
Source: thelongestlistofthelongeststuffatthelongestdomainnameatlonglast.com