I am 44 years old and in January was also diagnosed with TNBC Grade 3, Stage 1. The first couple of weeks are very overwhelming, once you decide on your treatment plan you will feel much better.
I had a lumpectomy, 16mm lump, at no stage was a mastectomy suggested and I took both my surgeon & oncologists advice because they are the experts.
I also had clear margins & no lymph node involvement but due to my age my oncologist recommended chemo, 3x FEC & 3x Docetaxol. Chemo was ok because I think I was expecting worse. I was lucky & didn't have too many side effects, but everyone is different. I drank lots of fluids & made myself eat.
I was a private patient & it cost me around $450 for chemo & medication.
I am currently undergoing 20 rounds of radiation which is very tiring because I have a 205km round trip each day for treatment but I'm now counting the days until I'm finished! For 6 months it feel like my life has been on hold.
Good luck with making those hard decisions, whatever you choose will be right for you.
:)