Yes, there are life insurance plans for people over 80 with health issues.
These plans are called "Guaranteed Issue" life insurance policies.
With a guaranteed issue policy your health is not an issue, you can get guaranteed approval and there's no health exam, and no health questions asked.
You cannot be turned down for coverage due to any health problems.
However, there are some age requirements with guaranteed acceptance life insurance.
For instance, some insurers offer guaranteed approval for people ages 45 to 85. While other insurers offer guaranteed approval for people age 50 to 80, or age 45 to 75.
Here's guaranteed approval life insurance for people age 80 and over