It actually is reversible but the longer you wait ,the less likely it is for the reversal to work. You probably have a 20 year window to reverse the procedure. Beyond 20 years ,pray and hope there's some new technology that'll allow you to have kids if you changed your mind.
During counseling, consultation etc.. you might have the uncomfortable "what if" discussion so that you fully understand what your getting into.. imagine a situation whereby you lose some or all your kids in an accident koso koso, and you are back to square 1..
Vasectomy is kind of extreme. It is like that fella who got so bored in jail that he tatooed his left eye blue and right eye red in the fourth year of a 20 year jail term. This probably saved him from having his kinyambis sorted out by jail alpha males. But little did he think of how people would react when he got out of jail. (True story)
A guy, you might suffer some serious anxiety induced ED. Before you do a vasectomy, ask your kunguru if she will have her uterine tubes ligated same day you switch your pipo off