Once you have passed the child bearing years, your ovaries are still doing a job of regulating hormones. And we can still get cysts in our ovaries! (that's a little annoying). Up to 14% of women that have gone through menopause get cysts. There is a wide range of normal for size of ovaries. Ovarian cancer is hard to predict and size of ovaries is not used to do so. But what prompted this question? Are you having issues with your ovaries? Or did you have a concerning exam?
No, size of ovaries is not related to your risk for ovarian cancer. This site does a good job of laying out the risks: https://ocrahope.org/patients/about-ovarian-cancer/risk-factors/
Is there a particular reason you're concerned?