 Continuing, among adults under 40 who are already parents, about one quarter don't expect to have more children due to the financial cost involved, while 3 in 10 say they're too old. Okay, so the survey says that 17% cite financial concerns for their decision to remain childless indefinitely, but I would guess that the real portion is much higher than that. I'm not sure I've ever spoken to a childless adult about this subject without them mentioning finances as at least one of the reasons for their childless lifestyle choice.