I've already replied similar question in RLT. According to wiki the average age for women at their first marriage in Russia is 24.9. Also 27.4 for men, so Misha Kolyada is still below average in his 25
Although common habit in developed countries today is having marriage and kids late in the 30s (because "career" is so important, right), having kids early has many advantages, above all you are just fit for them
It's not really about "career", women just want to be independent and having a life, this is not necessary being a "wife and mother"...... And the thing in developed countries is also, that many people can't afford having a family or even living on their own. That's why so many over 30 are still living with their parents. Having a secure job is rare, without a secure job you can't have your own place for living, ect.