A new long-term study out of Switzerland found solar panels installed in the late 1980s are still generating more than 80% of their original power output—three decades later. The results challenge old assumptions about solar lifespan and reinforce what Viva Energy sees every day: when systems are built right, solar power lasts.

If you’re over 60 and wondering whether solar still makes sense, you’re not alone. Many older homeowners — especially Boomers — are asking the same question. The answer? It depends on more than just age. Here’s how to think about solar in retirement.