How do I update my Macbook air's operating system from OS X version 10.9.5

Taxman08 Said:

"How do I update my Macbook air operating system from OS X version 10.9.5"

-------

Verify Compatibility:

A. Start Here: Learn About Compatibility and how to Identify your Specific Mac Model - Apple Support

B. How to Verify:

I. Reveal your Model:

What is the Model of your Mac? To find out...

1. Go to: Apple menu
2. Click: About this Mac
3. View: Second Line-Down

then...

II. Compare the Results:

See if the Model you found is shown here:

• How to Upgrade to macOS Sierra - Apple Support
• How to Upgrade to macOS High Sierra - Apple Support
• How to Upgrade to macOS Mojave - Apple Support
• How to Upgrade to macOS Catalina - Apple Support
• How to Upgrade to macOS Big Sur - Apple Support

Then...

C. Proceed with the Install:

• How to Get Old Versions of macOS - Apple Support
• How to Create a Bootable Installer for macOS - Apple Support