64 and had to apply for pip. I am worried i will lose mobility award

Have sent in the form and await contact from them. I dont think i will be successful. I was awarded dla indefinitely in 2012. I was given medical retirement from my career as I was unable to cope with my job. I was diagnosed in 2004 after suffering from 1986 and being told I should see a psychiatrist! My youngest son was murdered in 1993 which has had a profound affect on me mentally and physically. I hardly go out but if I do it is rarely on my own. I have amobility car without which I would be lost. I was diagnosed by a dla doctor, a doctor in my local hospitsl and a professor at guys hospital and a doctor who worked for thr medical executive in london. I will be 64 in 4 eeeks, will this matter?