Unaged goat cheese would basically be just freshly made goat cheese that hasn't been aged.
Fresh goat cheese is usually better tasting and softer than aged goat cheese and when goat cheese is aged it's supposed to taste better and have less faults to it.
Some people think that any unaged fresh goat cheese has a taste of metallic and sour without any nuance to it but for me the aged goat cheese doesn't taste as good.
But we all have different tastes as my mother prefers to eat aged goat cheese because she says it tastes better than unaged fresh goat cheese.
But for me I would rather eat fresh goat cheese.