Well people will not be happy with my opinion.
My mother had me when she was 39 and my father was 41. My father died when I was 7 (Ischemic heart disease - could not be predicted) and mother died when I was 21 (cancer). I had to look after my dying mother, when I was bearly past teenage years. I know not everyone dies as young as my parents did, but the older you get the more likely you are to die when your children are still young. I now have my own children, but they have no grandparents, and I have no parents to ask for advice!
Your DH will be 60 when your child is only 10. Early onset Alzheimer's disease can start at 55 yrs old. I don't know your medical history obviously, but you can't necessarily assume you will both be healthy in 10 years time.
That said, if all 4 'grandparents' are alive and well (ie. you and your husbands parents) and your family history (brothers, sisters etc) have lived to the ripe old age of 90+, perhaps the risk would be well worth it!!
We all tend to think we are invincible, but the fact is we are not! It's not pleasant to think about, but something to consider, because one of you may end up raising both children due to the death of the other.