Age ranges vary, saying under 30 is a fucking broad term. And even then, your very very unlikely to get seriously sick from Covid. I didn't, it was like a nasal cold.
Anyone under 18 is not at ANY risk from covid, this was advice and information the medical community agreed on. However, the vaccine doesn't care about age. Young and old people alike appear to get bad reactions. I'd say absolutely anyone over the age of 55 should be queueing up to get the vaccine.
Then after that it should be based on health and fitness. And no one under the age of 18 should be taking the vaccines, unless Covid poses a serious risk because of compromised immune system. Keep the experimental medicine away from kids.