35 this year, and MS2 (almost MS3!)...
Not sure if someone else said this already or not, but the non-med school people who aren't pursuing an advanced degree or a degree to better their lives likely speak against you or attempt to belittle your aspirations due to feeling threatened or intimidated by you, or they simply do not understand what you are doing with your life. Usually (in my experience) any time someone attempted to speak down to me in this way it was because of their own insecurities or their perceived inabilities to pursue their own dreams. Realizing this might help you tolerate the comments a little more - even if they are inappropriate and based in ignorance.
I had this happen several times before I got into medical school, when I was a 31 year old at the local community college... and now it's died down quite a bit.
And no - med school and being a doctor is not of more value or higher up on the totem pole than those who are in manufacturing, bank tellers, CNA's, or wherever - I only speak about those who attempt to belittle someone for pursuing that MD or BSN or PA or PHD or whatever degree. I come from a very humble family, and worked over a decade in the plants and entry level jobs. Those positions are incredibly valuable to our society - and at the end of the day it's the CNA or nurse that will pray with our grandparents as they go to sleep - not the MD's.