I could be wrong about the 7-way for older cows. I'm an engineer, not a vet. That's why I let my vet decide what vaccinations mine need. I suggest the original poster talk to a vet and do the same.

I also tell my vet that I want to see him twice a year. Spring work up and calf cut and fall workup and preg check. Sounds like you have a healthy herd.

Jim at Dawn