no, you are not too old! I know someone who trained as a doctor in their 40s. Age is only a number!
However, if you are older, you will need to consider if you physically and emotionally prepared for all the hard work training and being a doctor requires. (another 10 years atleast to be a consultant in which case you will be nearly 50?)
I strongly recommend you do some work experience, ti can be really helpful in allowing you to assess if medicine is really suited for you. You may be surprised by how much you hate it or love it!
you say you have done no science, that is only worrying in terms of the fact, how do you know if medicine is for you? you might hate or find science very hard?
Also, one last point to consider is your family life? Do you have kids or planning any, because training as a doctor may make this difficult? Considering your qualifications, I thnk you will defiantely face a challenge getting in to medical school, but that doesn't mean its impossible! if you want it enough, you can get it
Anyway, i wish you the best of luck in whatever you decide to do!