Nobody lives on borrowed time, take it from an expert, time doesn't work like that.
Your life is a product of a cosmic whip-round.
Your biological parents provided the chemical possibilities (which they obtained from their ancestors) and the rest is the product of generations of other factors (some of them human) adding to a high enough probability that you are alive now and near enough to a machine which is capable of displaying these words.
The doctors played their part too in this complex interaction of seemingly ordered but largely chaotic events but ultimately what is keeping anyone here from dissolving into a pool of abstract mathematics is a mystery.
Just keep on enjoying the ride the best you can.