He explained to The Sun newspaper: "I sometimes wonder if all the tragedies my family has suffered, like Andy and Maurice dying so young and everything that's happened to me recently, is a kind of karmic price we are paying for all the fame and fortune we've had.
"But we've worked hard for everything we've achieved.
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"I am not and never have been at death's door. But the illness, and the untimely death of my brothers, has made me conscious of the fact that -- rather than just think about it -- it's crucial that you do today what you want to do.
"I've got a sense of urgency about life, rather than withdrawing from it and feeling depressed.
"Now I know how precious time is, and that you can't put it in the bank. So I intend to make the most of every single second of it that I've got left."
Robin - who also has a sister Lesley and brother and fellow Bee Gee member Barry - admitted the death of his twin Maurice, from complications resulting from a twisted intestine, is something he will never recover from.
He said: "Maurice was in hospital for just three days. I flew to Miami to see him and he was in a coma.
"They told Barry and I that, if Maurice didn't have any brain activity within ten minutes, he would die then and there. To our horror, we found out there was none. And Maurice died.
"How did I get over Maurice's death? I didn't. And I never will. I just don't accept it. I tell myself he's away on a long holiday and that we'll be seeing each other again soon."