Most youth baseball starter sets target preschool to early-elementary ages. Listings commonly show ranges such as 3–8 years or simply "3 years and up," and product reviews often note suitability from toddlers through older children.
Adjustability varies by tee style. Examples from product listings include hanging beginner tees that adjust about 18"–26", traditional tee toppers that adjust about 25"–36", and flex tees with ranges around 22"–31".