A high-quality ergonomic chair usually lasts with proper care even longer like 5 to 10 years. How often it’s used together with how well it's maintained, plus the materials used determine its lifespan.
Ergonomic chairs are not like regular office chairs that do not maintain structure and support. Ergonomic chairs are built for handling daily use. That is why if one constructs a quality product, it pays off in the long run not just in comfort, but if it is durable too.
Durability starts with premium materials and design

Chairs made with metal frames tend to last far longer than ones made with plastic that is cheaper or fabric that is thin because breathable mesh and dense foam padding are features.
Find ergonomic chairs made with well-stitched or molded materials plus high-quality casters with a sturdy base usually metal or reinforced nylon. These parts stand against ripping, unfastening, or drooping. They do remain strong even after years of regular use.
The materials that are being better means the chair will more likely support your body then, keep its shape then, and avoid issues such as leaning or squeaking. If it feels as well as looks solid from the start, that is usually a good sign about a chair's lasting potential.
Usage habits and maintenance also affect lifespan

Using your chair correctly and take some care of it can greatly lengthen its life. Big changes come about from simple habits that exist.
Obey the weight limit the manufacturer specified, and do not sit on armrests or lean back too far. Mesh or leather surfaces should be wiped down occasionally along with bolts or screws should be checked occasionally. Wheels are required to be replaced if they wear out.
If your chair includes removable lumbar pads or else headrests, keeping of them clean truly helps. You extend overall use also when they are in good condition.
With reasonable care, your ergonomic chair becomes a long-term part of your daily routine not something that breaks down after a year or two. Yes, you can expect for a quality ergonomic chair to deliver on consistent comfort all the time and to last for several years.