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?