<p>Megastar Amitabh Bachchan believes the demise of his "Piku" co-star Irrfan Khan is "tragic" because his potential as an actor was left "unrealised".</p>.<p>The 77-year-old actor on Saturday posted a tribute to both Irrfan and veteran actor Rishi Kapoor who died within a day of each other after their respective battles with cancer.</p>.<p>In the post on Instagram, Bachchan touched upon "the death of an elder celebrity vs death of a younger one" topic.</p>.<p>"The death of an elder celebrity vs death of a younger... the grief of the latter more intense than that of the former... Why...? The younger more tragic?</p>.<p>"Why the loss of the young seems more tragic than that of the older? Because you lament the loss of opportunity in the latter... unrealised possibilities," the megastar wrote.</p>.<p>Irrfan, 54, lost his battle with a rare form of cancer and died in a Mumbai hospital on Wednesday. The actor was popular for his stellar performances in films such as "Maqbool", "The Warrior", "Paan Singh Tomar", The Namesake", "Jurassic World" and "Hindi Medium".</p>.<p>A veteran of Bollywood with over 150 films to credits during his five decade long career, Rishi died on Thursday at HN Reliance hospital here after a two year long battle with leukaemia.</p>.<p>On Friday, Bachchan posted a video tribute to Rishi, with whom he acted in films such as "Kabhie Kabhie", "Amar Akbar Anthony", "Naseeb", "Coolie", "Ajooba" and "102 Not Out".</p>.<p>The over five-minute-long black-and-white video features various stills from "102 Not Out". Bachchan can be heard singing a rendition of classic song "Waqt ne kiya kya haseen sitam" in the background.</p>.<p>The megastar wrote in the caption, "Waqt.. Waqt ne kiya kya haseen sitam .. Tum rahe na tum, hum rahe na hum."</p>
<p>Megastar Amitabh Bachchan believes the demise of his "Piku" co-star Irrfan Khan is "tragic" because his potential as an actor was left "unrealised".</p>.<p>The 77-year-old actor on Saturday posted a tribute to both Irrfan and veteran actor Rishi Kapoor who died within a day of each other after their respective battles with cancer.</p>.<p>In the post on Instagram, Bachchan touched upon "the death of an elder celebrity vs death of a younger one" topic.</p>.<p>"The death of an elder celebrity vs death of a younger... the grief of the latter more intense than that of the former... Why...? The younger more tragic?</p>.<p>"Why the loss of the young seems more tragic than that of the older? Because you lament the loss of opportunity in the latter... unrealised possibilities," the megastar wrote.</p>.<p>Irrfan, 54, lost his battle with a rare form of cancer and died in a Mumbai hospital on Wednesday. The actor was popular for his stellar performances in films such as "Maqbool", "The Warrior", "Paan Singh Tomar", The Namesake", "Jurassic World" and "Hindi Medium".</p>.<p>A veteran of Bollywood with over 150 films to credits during his five decade long career, Rishi died on Thursday at HN Reliance hospital here after a two year long battle with leukaemia.</p>.<p>On Friday, Bachchan posted a video tribute to Rishi, with whom he acted in films such as "Kabhie Kabhie", "Amar Akbar Anthony", "Naseeb", "Coolie", "Ajooba" and "102 Not Out".</p>.<p>The over five-minute-long black-and-white video features various stills from "102 Not Out". Bachchan can be heard singing a rendition of classic song "Waqt ne kiya kya haseen sitam" in the background.</p>.<p>The megastar wrote in the caption, "Waqt.. Waqt ne kiya kya haseen sitam .. Tum rahe na tum, hum rahe na hum."</p>