If you had family history of an untreatable disease that you had 50% probability of inheriting but it typically sets on later at like 40 years old

Yes,I would have. But for what it's worth, I would suggest not being too sure that any disease is untreatable down the road. A neighbor's daughter was born with CF, expected life span of 25 years. Then they came out with biologicals to treat it and she is now 27, married & doing well. She actually isn't sure what to do in life as everything with the med is so new: have kids, plan for retirement, long term plans that she never thought would apply to her.