In the little town where I grew up in Georgia, lots of older people attended bingo at the VFW a couple of times a week. Organizations like that in your area that have weekly events might be a good spot to make contact with the older people.
Also, there are usually several spots in town where you will find a group of older gents having coffee in the mornings.
Some towns have "Senior Centers" where the older people gather to have lunch. I don't know if they would allow it but it very well might be that you'd be welcome to go and speak to the group. Can't hurt to ask...
Sometimes major area employers will have a "retiree group" that gets together, that might be another group that would like to have you come in to speak.
You might watch for geneology club meetings and hand out slimjims as they depart their meetings (personal observation - people get more interested in family history as they age).
Do try to remember that these people grew up when the world was much different from today. Many if not most are very trusting of the government. Many if not most will tell you that healthcare is their top concern. The AARP survey I saw a month or so ago indicated that they are very trusting of DOCTORS, so I would encourage you to emphasize that we call him DOCTOR Paul because he is a physician and understands the situation that our healthcare system is in. Also stress that he is 72. That works to his advantage with this group.
I would also suggest that you emphasize to them that Dr. Paul is extremely concerned about the effect inflation is having on the savings of the elderly - if you explain to them that real inflation is around 10% and the government is only giving them a 2% COLA increase, which means they're losing their savings RAPIDLY.
I think you will find that seniors are very receptive to Dr. Paul but ONLY if you emphasize the issues that matter most to them. Their primary concerns will likely be healthcare, and their ability to afford it.