Dec 5 (Reuters) - Automotive parts retailer AutoZone AZO.N on Tuesday posted a better-than-expected 10% rise in quarterly profit as demand for its Do-It-Yourself (DIY) kits benefited from more people maintaining their existing vehicles instead of buying new ones. The new-car market is on a nascent recovery path after months of supply chain issues and lackluster consumer spending prompted by high interest rates and inflation. "The record-high average U.S. vehicle age (now 12.5 years) should continue to act as a strong growth tailwind (for AutoZone)," CFRA analyst Garrett Nelson said on Monday.