Validity of a property partition decree

Property partition suit of my mother filed in 1993 and final judgement in1996 , was in order stage and final decree was not sought from the court due to various issues , now I since I am back and aware of this , has reprocessed or reopened and got the final decree passed in Oct 2016 from the kannur Munsiff court. Defedents had not appealed or put any counter case after that till date . 1: It is 20 years since the order is passed, and judgement decree is released now - Is this valid and can i process this further. Will I have any legal issues 2:If this is not valid then what is the next action I should take up to validate this decree.