I know nothing at all about maths, like even basic school maths. However, I have often thought that, regardless of how much time existed or passed before I was born, there is no number big enough to multiply that pre birth time that will encapsulate the sum of the amount of time that will pass after my death.

Leaving big questions aside, like when time/space per se emerged, or when the conditions that support time/space will cease: how would I write the sum that my first paragraph outlined?

In non mathematical language: the time before now (my life) is some 't' , and my lifespan is some variable that can be accounted for as 't1'. What number say 't ♾️' (infinity time) can express the sum that will follow my time ('t' t1')