My husband had DNA testing through Ancestry. A woman of about the same age shares 973 cM across 45 segments. We determined that she was probably a first cousin; a child of my husband’s paternal uncle.
We had a cousin, one of this uncle’s sons, also take the Ancestry DNA test. He shares 1953 cM across 57 segments with this woman, so I think that it’s pretty clear that they are half siblings. The timing and circumstances fit well.
The really strange question that popped up though was that my husband and his male cousin shared 1967 cM across 72 segments. Their fathers were brothers, so even if my husband’s uncle was by some chance his father, it would not make sense. This new found female cousin is showing up as a cousin and nowhere near a half sibling. Could Ancestry’s DNA testing be that far off or could a first cousin have that much DNA in common?