**Core Concept**
The Integrated Child Development Services (ICDS) scheme is a government program in India aimed at providing nutritional support and early childhood care to disadvantaged children. The ICDS scheme focuses on the holistic development of children, including their physical, cognitive, and emotional growth.

**Why the Correct Answer is Right**
The ICDS scheme targets children from birth to six years of age, with a focus on those from disadvantaged backgrounds. This age range is critical for early childhood development, and the ICDS scheme provides essential services such as nutrition, health check-ups, and education to support their growth. The scheme also includes pregnant and lactating women as beneficiaries.

**Why Each Wrong Option is Incorrect**
**Option A:** Six years is incorrect because the ICDS scheme includes children up to six years of age, but it is not the upper limit of the age range.
**Option B:** Five years is incorrect because the ICDS scheme includes children up to six years of age, and five years is below this upper limit.
**Option C:** Seven years is incorrect because the ICDS scheme does not include children beyond six years of age.

**Clinical Pearl / High-Yield Fact**
The ICDS scheme is a crucial program for early childhood development in India, and its services are essential for the growth and well-being of disadvantaged children.

**Correct Answer: D. Six years.**