Non-Compete as an independent distributor

Will non-compete hold up, if I did not sign anything regarding the bonus program? I signed an independent distributor agreement in California with a Company from Cleveland, Ohio 23 years ago. It says I cannot go to work for a competitor and work in the same geographical area for one year after leaving the co. I built a successful "downline" type business and was led to believe I could retire after 20 years and receive monetary compensation based on the "promotee" production. I only signed the distributor agreement.There was no bonus program agreement signed. Now they say because I have gone to work for a competitor (in a different state) that I have forfeited my "bonus" money. The wording found in the bonus brochure is "in our sole opinion of the Company, directly or indirectly in any business which competes with the business of the Company, you shall immediately forefeit, etc" This translates into in excess of $500,000.00 forfeited.Will this hold-up in court?