Primary CNS LBC Non -Hodgkins Lymphoma

Hi, I am 73 and was diagnoised with non-hodgkins lymphoma in my brain in Jan of 2010.  I saw a post about primary cns lynphoma and was wondering if the posts would also be aplicable to me?  I have been on high dose MTX anf Rituxan since I was diagnosed.  At first it was every 6 weeks and my tumors shrunk.  After about 9 months the times between the high dose MTX was gradually increased.  One tumor was gone after 4 months and the other bigger one has left some evidence in the brain but according to MRI's has not had any activity since Sept of 2010.  I am back to driving and was back to work as a mental health therapist at a school.  I decided to retire the end of this year. I now get Rituxan every month and every 4 months a MRI and High dose MTX.  I have never met anyone who has PCNS DLBC NHL and was told it was rather rare.  I would like to communicate with those who have what I have.  I am doing well but really have no idea of what to expect.  I guess the fact that i am so old has some implications but somehow I'm still going and seem to get stronger every year.  Thank you.  Mary N.