Uhm take a reallly good biology class, or even read a good biology book.

Preserving your seed so to speak really doesn't matter. There really isn't any "life force" or "energy" as some people think. So you can't "use it up". There are 60 and 70 yo's who have fathered children.

Tony Randall, an American actor, at age 77, he fathered his first child. Actor Tony Randall Dies; Fussy Half of 'Odd Couple' (washingtonpost.com)