We Love Theme Parks

Is one old enough to visit theme parks? I don't think so because you see people of all ages enjoy theme parks. My father-in-law was 88 years old when he last visited a theme park in the US. He was still game with all the rides and he enjoyed it like a kid. Now I understand why my darling doll all of 18 years still want to visit theme parks. On her list are the theme parks in Florida. I gotta check these orlando hotels for their rate because we have nowhere to stay there. All our relatives in the US live far away from the theme parks that my daughter wants to visit. Do you think 4 days will be enough to enjoy all the theme parks? Who has been to the theme parks in Florida? Can you please share me some tips?