From Why are we vaccinating children against COVID-19? by Kostoff et al. (2021)

“people in the 65+ demographic are five times as likely to die from the inoculation as from COVID-19 […] the long-term cost-benefit ratio under the best-case scenario could well be on the order of 10/1, 20/1, or more for all the demographics, increasing with decreasing age”

I recommend reading the full study, it contains a lot of good information and isn’t too “sciencey” to understand. Here’s an extract of the two most important paragraphs: