I think that history will show that you're on the wrong side of this debate; we should be encouraging good parents to have more children, not less. We're facing a demographic crisis, her kids are going to help maintain the social safety net during your retirement.
And adoption is not a panacea: just ask anyone who's trying to adopt children on just how hard it is.
Edit after quick glance at comment history: luckily this isn't anxx's first impression of HN, and hopefully she'll be sticking around.
Anyway, just to reply to some of the comments: I mentioned the # of kids to present some reasoning behind the biological limitation to get married at 27. But kids and family are still fairly distant in the future for me, so it can change, I recognize that (i.e. haven't totally boxed myself in).
But let's even look at the more interesting side: men who want families have the OPTION of staying single well into their thirties without limiting the number of people who they could statistically find a match from. A 35 year old man has many more potential marriage partners than a 35 year old woman. And I think that is not going to change until it is as common for a 35 year old woman to date and marry a 5+ years younger man as it is for the reverse case.
I should mention that I am super open minded about these things - I am just observing some realities around me, not commenting on whether they are good or bad.
Most women I came across while dating in my early thirties were not open to the idea of a 5+ year difference. Many women in their mid-twenties consider 30 a magical number that some how makes you "too old". Less then four years of age difference seems to be more along the norm that women looked for. I've seen articles that confirm that as well.
That said, it is true that the exceptions for age difference favor men over women. Not sure what could be done to change that, but having a realistic expectation and timeline of your goal will go a lot further to it success then anything else. You realize you may have to hedge your bets to make it happen. Unfortunately many women will not pay attention to that fact until it is too late to make that choice.