Muscle repair failed - Is muscle repair failure very common in severe separation , is my age (50) and visceral fat an issue?

I’m 50 yr old female 30bmi. Had tt with muscle repair and I had an an impact to above my belly button. Immediately I had a hard lump and throughout the next couple of weeks I had pain, swelling, tenderness in my upper stomach. The bulging belly returned. Now below my bb is pulling apart. ISeen surgeon and we discussed mesh since I had 9cm DR and the repair failed. Is muscle repair failure very common in severe separation , is my age and visceral fat an issue? I have no doubt in my surgeons skillsbut I wonder if something is wrong with my fascia or if it will happen again? I couldn’t edit my question so I will add the injury happened several months after the surgery.