I'm surprised about the stem cell company. Stem cell storage companies are notorious scams. I remember doing research into these when my first child was born.

There's only a small subset of diseases it can actually help, and until you can actually grow organs, it's generally useless, for a lot of money. Also you can generate stem cells from adult blood cells or bone marrow anyway.

What the YC company appears to offer doesn't seem much more than a Silicon Valley Blood Boy, the unproven promise of youth from young blood.