Just a thought, but if aging is solved, people (esp. women) no longer need to get married in their 20s, 30s or 40s to have a family and start having kids.
This would remove a huge amount of pressure, and in turn would allow people to take longer and choose more selectively, so i would guess that while "till death do us part" is less likely, marriages will start lasting longer and ending more amicably.
Also if you're married and its not working but you have kids, waiting 20 years for your kids to grow up and leave home before you separate is much less of a big deal if your life doesn't have a time limit. So as far as children being raised in a solid family environment, we can expect that to get better.