To Be Ready

I was conversing with someone a little older than I concerning love and relationships, marriage and kids...and he asked me..."How does one know whether they're ready for marriage if they've never been married?"...he was generally asking this question leaning towards young adults in their 20's...he also asked me..."How does one know whether they're ready for kids or not if you've never had any?"

Do you guys, and gals, think you're ready for marriage and kids at your age?? Why and why not?