OP, I just wanted to tell you that we felt exactly the same after the first info evening we went to.
We were told, in incredibly condescending tones 'one of you needs to be prepared to be at home long term; if you have a pond, fill it in; if you are looking for under fives, forget it; parenting this child will be a constant trial; you'll essentially be looking after this child for their poor, poor birth family who aren't able to' etc, etc, etc ...
We left feeling completely deflated, and as though our feelings and needs, as adopters, were irrelevant besides the birth families. Honestly, after the time we'd been through with infertility we felt we needed, deserved even, a bit more.
We did go to a couple more information evenings though, and at the third one it was all presented completely differently. Yes, we would need to be prepared for all the things we had heard before, but they would work with us, help us, prepare us every step of the way. If we felt it was important to us to have a younger child, fine. We might wait a bit longer, but don't feel bad or embarrassed about it because contrary to common belief, many adopters do want older children (this was definitely the case on our prep group!).
I'm rambling now, but I guess I just wanted to say that I know how you feel, we almost gave up after that horrible first information evening.
We did go ahead in the end, with the agency we liked. The training was hard, and the process intense, but we have felt so well supported and valued all the way through. A year after starting the process, we had our wonderful little girl placed. She was almost two at the time, and 6 months later we are settling down into family life, and loving every second. She had been with a lovely foster family since birth and doesn't have any significant issues, life is incredibly normal for now. Yes, we'll have issues to deal with as she grows up but we feel confident we'll handle it as it comes! So I guess I just wanted to add another vote to the 'it's not necessarily doom and gloom' camp too.