(4) A policy which the insured has the right to continue in force subject to its terms by the timely payment of premium (a) until at least age fifty (50) or, (b) in the case of a policy issued after age forty-four (44), for at least five (5) years from its date of issue, may contain in lieu of the foregoing, the following provision, from which the clause in parentheses may be omitted at the insurer's option, under the caption, "Incontestable": "After this policy has been in force for a period of two (2) years during the lifetime of the insured (excluding any period during which the insured is disabled), it shall become incontestable as to any statements, other than fraudulent statements, contained in the application."