Does anything become incumbent upon me due to my delay in fulfilling a vow to slaughter a camel, which I vowed 29 years ago for the recovery of my son?

If you utter a phrase indicating your commitment to donate a camel as charity if your son is cured, then you must fulfill your vow immediately upon your son's recovery. If you did not specify a time, then delaying without an excuse causes you to miss the virtue of promptness. If you did specify a time and it passed without an excuse, then you must repent for the sin of delay. Scholars have differed regarding the obligation of an expiation for an oath (kaffarat yamin) for delaying without an excuse.