Disneyland is great for kids over the age of 7. Kids under age 7 do have to ride with an adult (or someone over the age of 14). So if you have 4 kids, 2 of which are under 7, you may have to watch which rides you can do.

At 7 years old, a child is actually at the absolute "sweet spot" for a Disneyland vacation. At this age, children are old enough to have the physical stamina to walk through the parks without a stroller, yet they are still young enough to be fully immersed in the "Disney Magic" and believe in the reality of the characters they meet. Most 7-year-olds meet the height requirements (typically 40" to 42") for nearly every major attraction, including "big kid" rides like Space Mountain, Big Thunder Mountain, and Star Tours, allowing them to participate in the full range of family thrills. Furthermore, 7 is a landmark age for Disney policy; it is the age at which a child can officially ride an attraction without an adult (as long as a guest 14+ is elsewhere in the park or on the same ride vehicle). This provides a sense of independence that kids this age find incredibly exciting. They also have a longer attention span for full-length shows and nighttime spectaculars like Fantasmic!. Far from being "too old," a 7-year-old is in the prime developmental stage to create lasting, vivid memories of the trip that they will cherish well into their teenage years and adulthood.