> If you are 25 you should be seriously thinking in the next 2 years, and by 30 have them

I need to push back on this because no one is actually an adult at the age of 25 despite those people wishing it were so. You do not have your shit figured out and assuming a partner of similar age, neither do they. It's only starting in your 30s where you start to understand what it is to be a responsible adult to yourself and to the world.

So please, do not seriously consider having kids in your 20s, for all our sakes.