English term
Peru
youth ages
Espero que puedan ayudarme con una expresión al español: “youth ages”, relacionada con la enseñanza de matemáticas en el huerto o jardín. He encontrado “youth” como jóvenes, pero no sé si sea lo correcto en este caso. Muchas gracias:
“For children ages 5-8, explain teams to find and draw in their journals at least two more examples of triangles and note where they found each one.
For youth ages 8-13, explain teams to find, draw, and label in their journals one of each of the following kinds of triangles: equilateral…”
GVL
Non-PRO (1): Chema Nieto Castañón
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Proposed translations
Experienced Subtitler and AV Translator
Native in: Spanish (Variant: Latin American) 
Works in: English to Spanish, Spanish, Spanish to English, and 3 more.
Preadolescentes de (8 a 13 años)
| agree |
José Manuel Miana
: I agree.
1 hr
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Thanks!
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| agree |
Ester Vidal
7 hrs
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| agree |
Oliver Romero
8 hrs
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| agree |
Georgina Grigioni
14 hrs
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| agree |
nahuelhuapi
: ¡Saludos!
2 days 16 hrs
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SPANISH-ENGLISH TECHNICAL TRANSLATOR
Native in: English 
Works in: Spanish to English, English to Spanish
etario juvenil
I am guessing. Not very sure if this expression is practically used.
Let's wait for others to contribute.
Spain
Edit & translation. Medical, Technical
Native in: Spanish
Works in: English to Spanish, Spanish to English, Spanish, and 1 more.
Edades comprendidas
Mexico
Confianza, certeza, creatividad.
Native in: Spanish (Variant: Mexican)
Works in: English to Spanish, Italian to Spanish, French to Spanish, and 6 more.
para edades de jóvenes entre 8 y 13
Uruguay
ATA-certified English-Spanish translator
Native in: Spanish (Variant: Latin American)
Works in: English to Spanish
alumnos de ...
En mi opinión, dado que no se puede hablar de preadolescentes de 8, 9 y 10 años, ya que son niños, tendríamos que caer en la larguísima "niños y preadolescentes de 8 a 13 años de edad. Para evitarlo, y tratándose de un entorno escolar, propongo la muy común (y salomónica) expresión "alumnos de ... a ... de edad".
Cuba
English to Spanish translator.
Native in: Spanish
Works in: English to Spanish, Spanish to English
Niños
edad temprana
La edad que se sitúa entre la infancia y la edad adulta.
https://www.biodic.net/palabra/edad-temprana/#.XfL2TehKiUk
https://www.linguee.com/spanish-english/translation/a una ed...
si no te convence porque suena muy técnico o poético
preadolescentes, como ya han apuntado
Discussion
No creo que sea necesario aquí ceñirse a una lectura literal (jóvenes edades; de edades jóvenes); jóvenes de entre 8 y 13 años, sin más, traslada el mismo sentido del original.