@OTguy94 I had the exact same concern but not to worry, Columbia does prepare you for working throughout the lifespan! In addition to the mental health and physical disabilities fieldwork experiences, you have the option to complete a "specialty" fieldwork experience in pediatrics, hand therapy, or whatever interests you. I personally plan to complete the pediatrics one unless my plans change once I begin grad school which is a definite possibility. I think there is a slight focus on mental health in the curriculum but that it still prepares you to deal with all types of OT because you'll be more sensitive to what's going on in the client's mind. I think that even if I get in off of NYU's waitlist I would still choose Columbia.. the way students talked about their relationships with faculty is what really stood out to me, it seemed like a really inspirational environment filled with passionate people.
Also you can find their curriculum along with class descriptions if you click on "Program's Bulletin" on their website or click this link:
http://columbiaot.org/wp-content/uploads/2015/07/Bulletin15-16.pdf
Hope this helps!