So if you wanna have a bunch of kids gotta do it in your 20s or marry/find someone much younger than you. Used to be true just for men but turns out it’s true for women too.
I'm familiar with and can recommend Reprotech [1], but any reputable firm will do. You can even establish a trust to manage your tissue beyond death.
(all of this is moot if non-reproductive specific cells can be coaxed into healthy reproductive tissue in the future [2])
[1] https://www.reprotech.com/
[2] https://www.theguardian.com/science/2018/oct/14/scientists-c...
...or at the end of the day, donor sperm is an easy option.
*edit
https://www.ncsl.org/research/health/insurance-coverage-for-...
IUI is not expensive — less than $1k. It's a high-touch turkey baster, with some cleaning and counting in-between.
Donor sperm is not expensive. Maybe $1k if you go through a formal process.