The lifespan of a lawn mower depends on its type, quality, and how well it is maintained. On average, a good lawn mower can last between 5 to 10 years, and sometimes even longer with proper care.

Electric and battery-powered lawn mowers usually last around 5 to 7 years. Their lifespan mainly depends on battery health and how often they are used. Replacing the battery can often extend the life of the mower.
Gas-powered lawn mowers tend to last longer, often 7 to 10 years or more. They are built for heavy-duty use, but they require regular maintenance such as oil changes, air filter cleaning, and spark plug replacement.
Manual reel mowers can last the longest, sometimes over 10 years, because they have fewer mechanical parts. With basic cleaning and occasional blade sharpening, they can stay in good condition for a long time.
To extend the life of any lawn mower, regular maintenance is very important. Cleaning after each use, storing it in a dry place, and checking the blades can make a big difference in performance and durability.
In the end, how long your lawn mower lasts depends more on how you take care of it than the model itself.