Absolutely! As, no doubt, would your children do for theirs if that horrible choice ever arose.I wouldnt like to have to choose between my children aged 31,30,20 and 18 or my parents/parents in law 87, 81, 80. I love them all. But I know my parents/in laws would sacrifice themselves a thousand times over for their grandchildren.
I'm not saying some lives are more precious/worthy than others I'm just saying that once you know your race has been run you are more than happy to see your younger loved ones flourish and survive.