Let's start with the question, "pressure from who?". Do you even care about their opinion?
As I age, I care less and less about vague social obligations like that. I live my life for me, not for them. Yes, there are things that are better/easier/whatever when you're young. There are also things that are easier if you start them when you're more experienced, or financially stable. None of them give a particular fuck about the calendar. You'll do them by 25. Or 30. Or 40. Or not at all. If you want to settle down and have kids, go ahead and do it now. If you don't, then simply don't. If you are career-driven, do whatever you can right away. This is true whether you're 25 or 55.