Sure, frozen embryos, frozen sperm and something like the "uterine replicator" from the Vorkosigan Saga (Bujold) [1] may allow this to happen.

I really doubt 60 or 70 year old women will gestate their babies [2].

[1] http://en.wikipedia.org/wiki/Vorkosigan_Saga#Technology [2] http://en.wikipedia.org/wiki/Pregnancy_over_age_50

Unless your hypothetical medical advances include more energy and physical flexibility, I'm guessing you're either not anywhere close to sixty or don't have kids. My wife and I (who don't have kids) have discussed that we don't even want a puppy (in contrast to adopting an adult dog) when we're sixty, let alone a kid. Our last puppy was six years ago, and we've sworn off them since. :-)

Why not have children when you're 25, then work from 45 until the end of your life?

So, live on debt until you're 45? No thanks.

Because that would imply that the grand parents are the bread winners in the family, instead of "enjoying their golden years".

Instead, we could make "the golden years" between 25 and 45.

Try convincing the Baby Boomers that, aside from not having a retirement any time soon, and aside from having their kids moving back home, they will be moving back with their significant other and get their own families started on Boomer's dime.

It's like that pop-psi tale about the guy who never knew what chicken breast tasted like. When being a child, his mother reserved the breast for the father because "he's the one who keeps us fed and clothed". Later when he was a grown up, his wife reserved the breast for the children because "they deserve the very best".

The irony being that the breast is the least-flavourful, blandest part of the chicken, and all those years he was actually dining on the best bits without knowing?

You are so right, sir! On so many levels...