writes:

As the airplane gets older, the odds that it is not flying gets higher.

Are you sure? Where did you acquire this information?

Simple observation at any GA airport.

How do you determine the flying history and age of an aircraft by simple
observation?

By comparing comperable age aircraft, the likelyhood is that the non-flying
fractions are both smaller and more likely equal.

How do you know that?

Because they are old, because the owners are likely old and have stopped
flying.

How do you know this?

Why?

Because comparing Cirrus with Diamond would make it harder to manipulate the
numbers to conceal any higher accident rate with Cirrus.