13 mo is a good age bc they are too young to know to be scared. We took our 18 month old on everything he could go on, but this year, when he will be 2.5, I'm a little worried. When my middle one was 2.5 he was afraid of pirates, the darkness on Spaceship Earth, and The Great Movie Ride (We finally went back on that after 3 years of refusals). We didn't even attempt Haunted Mansion.