If you have evidence that employees who are similarly situated but significantly younger are being treated more favorably, then that would normally give rise to an inference of age discrimination. Similarly, if employees of the opposite gender are being treated more favorably, that would typically give rise to an inference of gender discrimination, although this would involve reverse gender discrimination in your case.
Working alone is not a protected classification typically so the employer is permitted to choose employees for layoff on that basis.
Since the employer does not have a layoff policy in writing, they are typically free to choose employees for layoff on any basis they choose that does not involve discrimination in violation of federal and state law.
If you wish to preserve your job, it is best to retain a local employment law attorney to represent you and communicate the potential for a discrimination case if the employer chooses to lay you off on a discriminatory basis.
Good luck and take care.
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