No, 13-year-olds are not generally considered "little kids." While technically still children, falling within the adolescence stage between childhood and adulthood (beginning at age 13 and lasting until age 19), the term "little kid" usually refers to much younger children.
Understanding the Age Ranges
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Little Kids: This term typically refers to children in early childhood, generally ages 2-7, before they enter elementary school and their independence increases significantly. [Reference: Examples from Little League Baseball divisions for 5-8 year olds and observations from Common Sense Media reviews for shows appropriate for kids up to 13 years old].
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Older Children/Early Adolescents: Ages 8-12 are often seen as older children transitioning towards adolescence. [Reference: Discussion on Quora regarding a 13-year-old's view of a 12-year-old. The snippet points out the minimal age difference yet the perception].
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Teenagers/Adolescents: Ages 13-19 are generally considered teenagers or adolescents. While still considered children legally in most places, they are significantly further along in their development than "little kids." [Reference: Definition of adolescence as beginning at 13].
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Young Adults: The legal definition of adulthood varies across jurisdictions but is often set between 18-21 years of age.
Context Matters
The perception of a 13-year-old as a "little kid" depends heavily on context. An older teenager might use the term pejoratively to compare themselves to a younger person, but it isn't an accurate reflection of a 13-year-old's developmental stage. [Reference: Reddit discussion on the use of "little kid" as a pejorative term for 13-year-olds].
Conclusion
A 13-year-old is a teenager, an adolescent, and still a child legally, but not a "little kid" in the common understanding of the term.
