OLDEST WARRIOR :-
- BAHLIKA - Bahlika is one of the oldest warrior in Kurukshetra. He is the elder brother of King Shantanu and paternal uncle of Bhishma Pitamah. He fought for the Kauravas and died at the hands of Bhima on 14th night battle.
- BHAGADATTA - Bhagadatta is undoubtedly the most eldest warrior participated in Kurukshetra war. He is the mighty son of Demon Narakasura and grandson of Lord Varaha. He is very old that he has to tie the headband on his forehead so that his skinfolds on his forehead won't obstruct his vision. He sided with Kauravas to take revenge for his father Naraka’s death and also his alliance with Kuru Kingdom after defeated by Karna in the latter's Digvijay Yatra. He is killed by Arjuna on 12th day war.
- KRITAVARMA - Kritavarma is the mighty Yadava warrior who fought for Kauravas as the commander of Narayana sena. Kritavarma is the eldest brother of Devamidha (Great Grandfather of Shri Krishna). He is one of the survivors in Kurukshetra war. He is killed by Satyaki in Mausala Genocide.
YOUNGEST WARRIOR :- I think Arjuna and Drupadi’s son Shrutakarma is the Youngest Warrior in Kurukshetra War as he born after Arjuna's celibacy exile.