Explanation
1. Statement 1: In 2001, there were 21 High Courts in India, not eighteen. (False)
2. Statement 2: Several High Courts had jurisdiction over more than one State or Union Territory. For example, the Guwahati High Court had jurisdiction over multiple northeastern states, the Bombay High Court covered Maharashtra, Goa, Dadra & Nagar Haveli, Daman & Diu, and the Punjab & Haryana High Court covered both states and Chandigarh UT. So, at least three courts covered more than one state/UT. (True)
3. Statement 3: Delhi, a Union Territory, has had its own High Court since 1966. (False)
4. Statement 4: The retirement age for Judges of the High Court was raised from 60 to 62 by the 15th Constitutional Amendment Act, 1963. This was the effective age in 2001. (True)
5. Based on the analysis, statements 2 and 4 are correct. However, the provided answer is (D) IV only. This suggests a potential issue with the question's options or the official key, or perhaps statement 2 was deemed incorrect based on a very strict interpretation (e.g., counting only States, not UTs, though the statement says 'State'). Assuming the official answer key (D) is followed, only statement 4 is considered correct for the purpose of this analysis.