(I used to work in a fertility lab)
Pregnancies have occured using sperm that was frozen >20 years prior. I’ve heard (but doubt) the “record” is 47 years. No cite, sorry, but like I said, I doubt it. The thing that makes me wonder is who wanted to use 47 year old frozen sperm.
It is common for males undergoing chemo, etc, to freeze sperm. We had patients as young as 12 or so with testicular cancer whose parents and oncologists had them bank sperm. However, you’re going to have a hard time finding a physician that’s going to order the cryobanking and perform a vasectomy on an 18 year old childless healthy male who wants children in the future. (Labs can not bank sperm without a physicians order.)
That said -
Rough estimates on cost (YMMV, and keep in mind the cost is going to increase over time.)
I have no idea how much the vasectomy costs, but it’s not commonly covered by insurance.
Initial cryopreservation, setup, administrative costs, etc - about $500, plus $50 - $100 for each additional sample (you’re going to need about 20)
$250 - $500 a year to preserve samples.
(Again, not generally covered by insurance)
Now, say, 15 years from now, you want to use the sperm.
it’s around $500 to thaw and inseminate your wife with the sperm. Each try. Average number of tries to create pregancy is (IIRC) 3.
One last thing - IVF and artificial insemination aren’t the same thing. IVF is invasive to the female, removing the egg and ferilizing, then transplanting the blastocyst back into the female. What I described above is artificial insemination. IVF costs $20,000.00+, is horribly painful, emotionally traumatic, and is the next step if pregnancy doesn’t occur via AI, and you still want to have children that are biologically yours.