Time flies

When I started work at my current job I said I would give it 5 years. I wanted to leave by the time I was 28 and try to forge a different career, a different life. I’m 35 now and still in the same job. How did that happen? I cannot blame anybody for it was my own choice. And I am not unhappy with my choices but I do still look back with some regret. I think to myself that I want to have children but I still want to see the world. And if I settle I would love to settle elsewhere. I tell myself why did I not travel more earlier? Is it too late to change?