I was terminated from a small auto repair shop and was replaced by a younger white guy. I'm 55yrs old black man. I feel I was discriminated against.

Ohio law forbids discrimination because of race and age.  If you choose to pursue one or both of these claims, you can do so by filing a charge with the Ohio Civil Rights Commission or Equal Employment Opportunity Commission or by hiring an attorney.  In order to establish a basic claim, you have to prove that you are in the protected group (i.e. African American and over 40 years old); that you were qualified for your position (good performance, little or no disciplinary actions); and suffered an adverse employment decision (fired).  Once you meet this basic criteria, then the employer has an opportunity to respond by stating a "legitimate non-discriminatory" reason for your discharge.  It's then up to you to show how this reason is not the "real" reason.