**Core Concept**
Bone age is a measure of the maturity of a child's bones, which can be assessed through radiographic examination. It is an important indicator of growth and development, and can be used to diagnose growth disorders, such as growth hormone deficiency or constitutional delay of growth and development.

**Why the Correct Answer is Right**
Bone age typically corresponds to chronological age in children who are growing at a normal rate. In these individuals, the bone age is usually within 1-2 years of their chronological age. This is because the bones are developing at a steady rate, reflecting the normal progression of growth and development. The **bone age assessment** involves evaluating the ossification centers, epiphyseal development, and other radiographic features to estimate the child's bone age.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not correct because bone age can be delayed in children with growth hormone deficiency or constitutional delay of growth and development, where the bone age may be significantly below the chronological age.
**Option B:** This option is not correct because bone age can be accelerated in children with precocious puberty, where the bone age may be significantly above the chronological age.
**Option C:** This option is not correct because bone age can be irregular in children with certain genetic disorders, such as Turner syndrome or Klinefelter syndrome, where the bone age may not correspond to the chronological age.

**Clinical Pearl / High-Yield Fact**
A child's bone age can provide valuable information about their growth and development, and can help diagnose growth disorders. It's essential to remember that bone age assessment should be performed by a qualified radiologist or pediatrician to ensure accurate results.

**Correct Answer: D.**