The entrance fee of Ocean Park(https://www.travelchinaguide.com/attraction/hongkong/island/ocean_park.htm) is HK$250 for Adult and HK$125 for children from 3-11 years old, while that of the Disneyland(https://www.travelchinaguide.com/attraction/hongkong/outlying/disneyland.htm)is HK$ 350 for adults, HK$ 350 for students from 12 to 25 years old, HK$ 250 for children between 3 and 11 years old and HK$ 170 for seniors of 65 years old or above.
There are special annual passes for disneyland, classified into value, deluxe and premium ones whose prices are different for people of different ages.