seasonsinthesun - I'm really sorry for both of your losses :( However, old your parents are when they die, it's too soon for you to lose them.
The thing though, with losing an 'older' parent is the 'small' comfort you can take from knowing that they did live a long (& hopefully happy) life. When you lose a 'younger' parent, you not only grieve for your own loss, but the loss of the other 20 or more years they should have had to enjoy their life, their retirement, their grandchildren etc. I think this is why people feel if 'they have had a good innings' it isn't quite so bad.
It's like if an adult loses a parent it can be completely devastating, so much more so than might expect it to be as an adult, yet, I still think it's so much worse for a child simply because they haven't had the benefit of being brought up to adulthood by that parent. That's not to minimise the pain of the adult losing a parent, simply to acknowledge how much more a child a losing.
Does that make any sense?
It can be devastating though, no matter how old they, or you, are - there's no getting away from that x