Maybe you've heard that having children before you turn 30 can reduce your risk of some cancers.
Maybe you've heard that it is easier to lose the baby weight if you have children in your 20s rather than waiting.
Perhaps you want to give your parents their grandchildren while they are still young enough to enjoy them and to babysit for you.
These are all great and valid reasons to have children before you are a thirty-something.
I give you Reason #618 to have children before you are 30:
Once arthritis sets in, it is virtually impossible to open a sippy cup if the lid has been properly secured.
... off to find a hammer
~Plain & Simple As That