A policy or contract of motor vehicle insurance may not be canceled or nonrenewed solely because of: the age of the holder of the policy or contract; or the physical handicap or disability of the holder of the policy or contract. The premium for a policy or contract of motor vehicle insurance may not be increased solely because: an insured under the policy or contract is older than 65 years of age; or the holder of the policy or contract has a physical handicap or disability, unless there is actuarial justification for the increase.