What is the minimum age to be an Activator?

The lower age limit for activators is 18.

Anyone can volunteer for the club and help out, however, to officially become an activator you would need to be at least 18 years of age with a valid ECB DBS.  
  
Volunteers under the age of 18 would not be able to complete the checklist requirements that an official activator must complete to meet compliancy.  

Other articles that may be useful:

https://allstarscricket.zendesk.com/hc/en-us/articles/360000357958-What-is-the-correct-ratio-of-adults-to-children-

https://allstarscricket.zendesk.com/hc/en-us/articles/360004137058-What-experience-is-needed-what-values-should-a-Dynamos-Cricket-Activator-embody-