Hi,
I was diagnosed at 42 and had sibling matches, but my doctors' chose to go with IST for me. I am forever thankful that they did, as here I am 10 years later. Be sure to check out the statistics for Transplant vs IST for those > 40.
The recovery from transplant will take a lot longer than the recovery from IST. Some transplant regimens include ATG for preconditioning, if that is any consolation.
There are some great videos on AA, IST, Transplants, and the latest research from experts across the country at:
https://www.pathlms.com/aamdsif
Hope your body can stay stable or turn this around. It is possible.