Yes—reputable ad blockers are generally safe. However, not all ad blockers are created equal. Some free versions found online can actually contain malware or sell user data. Seniors should only download ad blockers from trusted sources, such as the official browser extension stores (Chrome Web Store, Firefox Add-ons, Microsoft Edge Add-ons, etc.)
I believe that ad blocking software is safe for everyone, including seniors. After all, ad blocking software like adblock can make the internet a safer, cleaner, and more enjoyable place for seniors. But as mentioned above, software can vary. That’s why it’s important to read reviews and learn more from other users before using a particular software.