**Core Concept**
The fusion of epiphyses, or bone growth plates, is a critical indicator of skeletal maturity and age in forensic medicine. The timing and completion of epiphyseal fusion vary across different bones and sex, providing a valuable tool for estimating age in individuals.

**Why the Correct Answer is Right**
The correct answer is based on the fusion of the epiphyses at the elbow, shoulder joint, and clavicle, which are among the last to fuse in the human skeleton. **Option 4** (fusion of the ramus of pubis and ischium) is incorrect because these bones fuse much earlier, typically between 2-4 years of age. The fusion of the elbow (1) and shoulder joint (2) epiphyses is a reliable indicator of skeletal maturity, as they typically fuse between 14-16 years of age in males. The fusion of the clavicle (3) epiphysis also occurs between 18-22 years of age, which is close to the age of the individual in question.

**Why Each Wrong Option is Incorrect**
* **Option A:** Fusion of the elbow epiphyses is not a reliable indicator of skeletal maturity in isolation.
* **Option B:** Fusion of the shoulder joint epiphyses is not a reliable indicator of skeletal maturity in isolation.
* **Option C:** The ramus of pubis and ischium typically fuse much earlier in life, around 2-4 years of age.

**Clinical Pearl / High-Yield Fact**
In forensic medicine, the fusion of epiphyses can be used to estimate age, but this method is not foolproof, as individual variations can occur due to genetics, nutrition, and other factors. A comprehensive assessment of skeletal maturity should consider multiple indicators, including the fusion of epiphyses, the closure of growth plates, and the development of secondary sex characteristics.

**Correct Answer:** D. 16-18 years.