Section 750 ILCS 5/302 - Time of Commencement(a) A declaration of invalidity under paragraphs (1) through (3) of Section 301 may be sought by any of the following persons and must be commenced within the times specified: (1) for any of the reasons set forth in paragraph (1) of Section 301, by either party or by the legal representative of the party who lacked capacity to consent, no later than 90 days after the petitioner obtained knowledge of the described condition;(2) for the reason set forth in paragraph (2) of Section 301, by either party, no later than one year after the petitioner obtained knowledge of the described condition;(3) for the reason set forth in paragraph (3) of Section 301, by the underaged party, his parent or guardian, prior to the time the underaged party reaches the age at which he could have married without needing to satisfy the omitted requirement.(b) In no event may a declaration of invalidity of marriage be sought after the death of either party to the marriage under subsections (1), (2) and (3) of Section 301.(c) A declaration of invalidity for the reason set forth in paragraph (4) of Section 301 may be sought by either party, the legal spouse in case of a bigamous marriage, the State's Attorney or a child of either party, at any time not to exceed 3 years following the death of the first party to die.