Ok this is going to be a few questions in lump together, but the idea is really about family and your over all view on that and particulars. The purpose is to get your take. Feel free to give your reasons for your answers as you like.
What is the oldest age anyone should start a family?
I would say Male 30, Female I would say 30
What is the oldest age anyone should stop having children?
For males i would say 50, Female 40
How what is the largest age difference you feel is appropriate when considering marriage, making a family or adoption?
Provided either is over 21, I don't think it makes any difference even a little bit.
Should there be a limit on how many children people should have (including adoption), if so based on what criteria?
Yes, based on how many financially and psychologically one or more parent can handle. I think it should be objective based on prudent research.
Ok last question the big one what are the 3 things you think are most important for Dating, Life, and Children?
Dating:
1. Finding someone you love and loves you.
2. Finding someone you enjoy being around.
3. Finding someone in good and bad will be there for you and vice verse.
Life:
1. Fill your life with love
2. Treat everyone decently and fair
3. Take time to enjoy life (Details matter)
Children:
1. Make sure they always feel safe.
2. Make sure they always feel loved.
3. Make sure they are secured and taken care of Physically, Mentally, Emotionally.