Ceiling on age limit to adopt infant?

Even though we're finalizing the adoption of a beautiful Guatemalan boy, we're already thinking about baby #2! :D I've heard a lot of talk about age limits on adoptive parents of Chinese infants. However, all of what I have heard tells me that both parents have to be at least 30. My husband turns 30 in 2007, however, I'm embarrassed to say that I will then be nearly 38! Is there an age "ceiling" on adoptive parents, or could we comfortably plan to adopt an infant from China until I reach the age of 40 (for example)? Thanks for the feedback!