TBH that is the most ridiculous thing I have ever heard. How can a child be too young to experience anything? Children get different things from experiences at different ages - but they are all valid and part of development, regardless of whether they remember it! We took DD to DLP when she was 4 months old, it wasn't for her as such, it was for us as a family but she had a wonderful time experiencing the colours and the music and was fascinated by everything. We will be taking her again in Feb for her 3rd birthday and I can't wait, she will be in awe of everything, she is just coming to that WOW stage, where everything is wonderful and she loves imagining she is a princess and dancing etc. I really don't see how that can be too young for the magic of Disney. We accept she won't be able to go on all the rides, and will need a nap etc. but her face when she sees the castle, and the princesses and Mickey etc. will be priceless!
It will be amazing! Enjoy every second!