A 100 year old can eat canned food.
Or if you meant can you eat 100 year old canned food then the answer is yes.
You can eat 100 year old canned food as long as the jar lid or canned food has no rust or holes in it or no severe rust.
Canned food can last for basically forever although it has an expiration date.
Expired canned food is safe to eat and is just as good as fresh canned food as the food being in a can helps to preserve it and make it shelf stable.
Most shelf-stable foods are safe indefinitely.
In fact, canned goods will last for years, as long as the can itself is in good condition (no rust, dents, or swelling).
Packaged foods (cereal, pasta, cookies) will be safe past the 'best by' date, although they may eventually become stale or develop an off flavor.
While canned goods past their "best-by" date may not taste optimal, there's no real health risk in consuming canned goods as long as they remain in good condition.
If the can is leaking, bulging, or swollen; the container looks damaged, cracked, or abnormal; the container spurts liquid or foam when opened; or. the food is discolored, moldy, or smells bad then it should be thrown out.
Although it's a rare occurrence, botulism is generally associated with improper home canning, but may still be found in some consumer food products.
It's a serious illness that paralyzes muscles and can even lead to death.