Sale agreement

Why the agreement not executed for so many years? was there any condition attached to it as to the performance of the contract? If not then, he cannot legally force you to sell it to him now. 

Thank you for the reply.

The person (with whom the agreement was made ) is now telling that the site had been mortgaged by my mother for some other loan that s why he was silent for so many years . But in fact all the loans which my mother owed to Bank had been cleared in 2003.

Can we construe this as a condition attached ? But this condition isnt mentioned in the agreement

If it is not mentioned in the agreement then, no need to consider it as a condition precedent to the sale. And in any case even it had been so, as the loan was cleared in 2003, the agreement is still unenforceable now. The limitation is 3 years from the cause of action. So no need to worry.