A third major California health insurer has agreed to scale back insurance rate hikes this year for thousands of customers after postponing the increases for 60 days at the request of the state’s insurance commissioner. Health insurance rates for 65,000 Californians with individual policies from Aetna, Inc. will rise an average of 12.2%, beginning July 1. The increases were trimmed back from an average of 17.9% after Insurance Commissioner Dave Jones raised concerns. The reduction will save Aetna policyholders $6.7 million in premiums, a company spokeswoman said. Jones said the 60-day delay has saved customers another $1 million.