You won't be a developer until you're 90. At some point, you'll slow down relevant to a younger developer. That's where you're value to a company will decrease.

You won't be a developer until you're 90. At some point, you'll slow down relevant to a younger developer. That's where you're value to a company will decrease. Your company or a potential employer will perceive you as expensive and lay you off or not hire you. My best advice is to make yourself indispensable to a company and hope the company will stick around. Or create your own company that you can control.