The phrase "a young schoolboy" is correct and usable in written English.
It can be used to describe a male student who is of a young age, typically in primary or elementary school.
Example: "The story revolves around a young schoolboy who discovers a hidden talent for painting."
Alternatives: "a young student" or "a little boy in school".
"I saw it first as a young schoolboy who would go to every home game as a Chelsea fan.
But it was around this time, in the late 1970s, when I was a young schoolboy in Tripoli, that the risks had become more real than ever before.
"You piece together what you know and imagine how things could have played out in rooms 40 years ago, most of the players long since dead," writes Mr. Lazar, who was a young schoolboy when his father was killed.
As a young schoolboy in Bristol, Peter Higgs was so inspired by the life and work of the Nobel prize-winning Paul Dirac that he pursued a career in physics.
I remembered my friend telling me that, as a young schoolboy and wartime evacuee, he and his fellows would creep up that fire escape into the room where weekly film shows were held – a few minutes late so as to avoid paying.
"We noted the email opened with notification of a young schoolboy's apparent murder and continued with information about an 'anti-truancy' product," the ASA said.
She later married Liverpool poet Roger McGough, but remembered McCartney as growing from a "plump young schoolboy into someone very much his own person" during their time together.
Have you ever paused to consider how a young Muslim schoolboy, perhaps second- or third-generation, in Beeston or Bethnal Green, might react to polls suggesting his fellow Brits think he "creates problems" or pundits who suggest he's a threat?
Until this year, only a marble monument commemorated the death of Hector Pieterson, the young schoolboy who was the first to die in the 1976 student uprisings that began in Soweto and spread across the country.
In an episode I am shocked reviewers have not made more of, the (very) young schoolboy Lucy is trapped by bullies in a trunk by an abandoned railway trestle, which his tormentors then pretend to saw in half.
About 40 minutes later, a yellow school bus stopped at the spot where the man had fired and let off one young schoolboy, who smiled as he walked down the sidewalk wearing a backpack on both shoulders.
