(Leah Hogsten | The Salt Lake Tribune) Irvin Torres, 12, gets his Covid vaccine from MSgt. Colton Shakespear with the Army National Guard. Torres just turned 12 in July and was receiving his second shot in August. The Pfizer-BioNTech coronavirus vaccine has been shown to be safe and highly effective in young children ages 5 to 11 years, the companies announced early Monday morning.