Yes. The Jaws shark was supposed to be around 25 feet long, and great white sharks as long as 25 feet have been spotted. The average size of a great white shark is around 14 to 16 feet.
The shark in Jaws (nicknamed by the cast Bruce), was 25 feet long and weighed 3 tons. This was pointed out by Quint, after Hooper said the shark was only 20 feet.