It has taken me a long time to get round to reading this. It has an odd reputation, some regard it as a SF classic and yet others as piece of very superficial military SF. I fall between the two, I read it fairly quickly as it is a very easy and undemanding read with some interesting ideas. Having said that they are not necessarily fresh and it is not a pure classic like Forever War that has stuck in my head years after having read it.
So, here we have geriatrics being recruited to undertake some changes and regain their youth provided they become soldiers in wars being fought a long way from Earth, an Earth they will never return to.
It's easy to be critical because this does lack real depth, but it does remain an easy and entertaining read. It explores some issues about youth, love, marriage and policies of aggression but within a fast moving environment packed full of action.
So I quite enjoyed it and may pick up the sequals, but I am in no rush to do so,