The term 'Wise Old Head' can be broken down into two crossword solutions: SOLON (5 letters) and SAGE (4 letters). SOLON was an Athenian statesman, lawmaker, and poet who lived in the 6th century BC. He is credited with creating the first written constitution of Athens and is remembered for his wise counsel and moral integrity. SAGE is a term used to describe a wise and experienced person, often associated with old age.