If this is a title for a blog post or social media caption regarding "Old Money" aesthetics or refined taste:
If this refers to a vintage Porsche (like a 356 or an early 911) being a "mature" investment that started for "pennies," you might use: mature penny porsche
"The Mature Penny Porsche: How a modest investment in classic German engineering became a timeless masterpiece. Witness the evolution of a legend that aged like fine wine without breaking the bank." 2. A Playful Nickname If "Penny" is the name of a well-maintained, older Porsche: If this is a title for a blog