My question involves a marriage in the state of:connecticut

I have been divorced for 15 years, at the time of our divorce our property settlement agreement stated my ex-husband had to provide life insurance in the amount of 100,000. He has never done this, can I go back to court at this time to make him do it? I was told by someone that a property settlement agreement is a contract and it is past the statute of limitations. Any input would be appreciated.