+1 (Totally, agree)If someone wants children, its probably best in their early twenties. Reasoning:
1/ less chance of age-related problems (downs syndrome, etc)
2/ more energy to look after the children
3/ once you hit 40 and they're out of the house, you can then enjoy the home and life that you and your partner have built
Most people aren't really gonna want to have children just leaving the nest when they're sixty-plus. Kids take energy, which you have less of in the 50's-60's - unless you're that rare person who is very energetic.