"Tender age" is a phrase often used to describe young children. However, various other terms can be used as synonyms for this phrase, such as "early childhood," "infancy," "youth," "toddlerhood," "babyhood," "pre-school age," and "primary years." These synonyms are commonly used in different contexts, such as educational, child development, or parenting-related discussions. For instance, when talking about early childhood education, "pre-school age" is often used as a synonym for "tender age." Additionally, "babyhood" and "toddlerhood" are used when referring to the very early stages of a child's life. Overall, these synonyms provide a range of options for describing the various stages of a child's development.