from typing import List
import pandas as pd

def createDataframe(student_data: List[List[int]]) -> pd.DataFrame:
    """
    Create a DataFrame from a list of student data.

    Args:
        student_data (List[List[int]]): A list of lists where each inner list contains [student_id, age].

    Returns:
        pd.DataFrame: A DataFrame with 'student_id' and 'age' as columns.
    """
    colnames = ["student_id", "age"]
    try:
        result = pd.DataFrame(student_data, columns=colnames)
        return result
    except ValueError as e:
        raise ValueError("Input data does not match the expected column structure.") from e