You never know, Marci.
We were open to siblings and kids up to age 5 or 6. But we wanted low legal risk. And who were we matched with? A healthy 3 month old who we adopted 9 months later! So under 2 is not necessarily a barrier. I know several other families who fost-adopted infants as well.
We adopted through foster care because we had several friends who went that route, so it was familiar. And it just felt right. I don't really have any better reason to offer than that. We briefly considered private adoption, but it just didn't feel like the right way for us to go. We are planning to do another fost-adopt when our son is a little older.