I went through 6 rounds of IVF between age 41 and 43 using the sperm of a known donor. I'm now in a relationship with a female partner, and my partner (aged nearly 41) is about to start IVF with an unknown donor, and I will be the co-parent. Despite being wholly committed and supportive of my partner's process and the fact that any success will be our baby, not hers alone, I still have niggles about the fact I don't know if I might have succeeded trying with an unknown donor. Some people say switching the donor makes a difference; also some say using much younger donor sperm can repair older eggs and lead to success. My known donor was a friend who had smoked for 25 years and was around 40 himself.
My question is should I start IVF again, even just for one more round, using an unknown donor, at age 45 (turning 45 in August)? Or should I just accept that it wasn't my destiny to have a biological child, and instead throw myself fully and solely behind my partner's journey and become the best co-parent I possibly can be?
Extra details: in 6 rounds I created only one blastocyst and had a failed transfer. Feedback from the clinic was that because my embryos generally degenerated at early stages ie up to Day 3, that indicated that it was egg quality that was the most likely reason for no success, not the sperm. I got the sperm tested and found it was mediocre, generally okish, but not brilliant quality.