Maryland Code, Insurance § 16-205

(b)(1) If an application or policy expressly limits the insurable age and the correct age at the date of issue is outside the insurable age limit, the policy is voidable at the option of the insurer during the lifetime of the insured, but not later than 3 years after the date of issue of the policy.

(2) If the insurer exercises the option to void the policy, the insurer shall return to the insured the aggregate of gross premiums charged on the policy, less:

(3) The insurer may not exercise the option to void the policy more than 30 days after the correct age is established.

(4) Subject to paragraph (5) of this subsection, if the insurer does not exercise the option to void the policy or if the age discrepancy is not discovered within 3 years after the date of issue of the policy, the insurer may not void the policy and the amount payable shall be determined in accordance with subsection (a) of this section.

(5) If the premium rates of the insurer at the date of issue of the policy do not include a rate for the correct age, the amount payable shall be determined in accordance with established actuarial principles.