The word "youngest" is correct and usable in written English.
It can be used to describe someone or something that is the most junior in age, size, or importance within a group. For example, "The youngest child in the family was only five years old."
Eleven-year-old Haley Joel Osment's nomination for The Sixth Sense showed that the academy's weakness for child actors is alive and kicking, though he is far from the youngest ever.
The youngest is 18, the oldest 71.
For Tsipras, the youngest leader to hold high office in modern times, what lies ahead is a litany of choices with potentially explosive effect.
In 1974, he became the youngest fellow of the Royal Society since I don't know when, so he had attracted public attention.
The youngest of five children, Musharaf says he developed a stammer very suddenly when he was five.
Senna pipped the Frenchman to the title that year, saw Prost take it ahead of him in 1989, and was then crowned champion in each of the following two seasons, becoming the then youngest three-times champion in 1991 at the age of 31.
The youngest brother, Thomas Garnett, was a textile manufacturer, with a business in Clitheroe where he employed several hundred men.
They diagnosed my eldest daughter with attention deficit hyperactivity disorder (ADHD) – our local services had missed this totally – and offered therapy to my youngest daughter to help her deal with nightmares.
I am the eldest, the youngest is one year old.
Victory would be a remarkable feat and make the SNP candidate for Paisley and Renfrewshire South the youngest ever MP, as well as overturn the 16,610 majority of one of Labour's biggest hitters in Scotland, shadow foreign secretary Douglas Alexander.
Family Tax Benefit Part B was designed for families with one main earner and single parents, with a slightly higher payment for those whose youngest child is under five.
