No life insurance company nor any of its agents shall knowingly make, issue, or deliver in this state any policy or contract of life insurance which purports to be issued or to take effect as of a date more than six months before the application therefor was made, if thereby the premium on such policy or contract is reduced below the premium which would be payable thereon, as determined by the nearest birthday of the insured at the time when such application was made. In determining the date when an application was made, under this section the date of execution of the application or the date of medical examination, where such examination is required, whichever is later, shall govern.

This section does not prohibit the exchange, alteration, or conversion of any policy of life or endowment insurance or any annuity in the manner provided by section 3915.12 of the Revised Code, nor does it invalidate any contract made in violation of this section.