How do you get a quality job at nearly 50

I just cannot understand it,i myself have been self employed for over 20 years running my own courier company.The only problem,the contract i had was with a worldwide company delivering parcels and sensetive mail i ran my company within this large network.At one time i had 120 staff members and everything was good until the mother company employed a service centre manager.This evil person had a partner who also ran a small delivery company,within 2 months i had lost 15 years of hard work building my own company.Overnight everything was lost.My company that i had worked so hard to get went bust i had a lot of knowledge and tried to start another company, but by this time this evil person had made my good name "Mud" I could not stop what came next i also went bankrupt. My life was now in ruins at this present time i have nothing. After being a company Director you would of thought it was easy to get a quality job,but being the age i am no company seems to want to use this vast amount of knowledge that i now have,with no formal qualifications i must look pretty useless to prospective employers. What these employers do not understand is a 50 year old man can bring a wealth of new ideas and knowledge to companys stuck in this new fast living age.In fact a man of my age will stay with a company until retirement age.To many companys tend to employ college graduates who may be very good but are missing one thing common sense. Think about it this way when you were younger and you had a problem who could you ask for advice,YOUR PARENTS these people may be 20 or so years older than you and they have the Knowledge they are also streetwise.So why do i have trouble getting work i could help and pass on my knowledge to younger people.I have many talents so if there are any companys wishing to employ me please email me at paul.green53@btinternet.com. Many thanks Paul Green