Firstly I'd like to say that those are some beautiful photos! I have similar thoughts to you, I'm turning 30 this year and I know it sounds silly, but it's starting to freak me out! In terms of thinking ahead, the direction in which to go, financial stability and reliability etc. I try not to get in my head too much, people around me sometimes ask me about having children, and as much as I love children, it terrifies me knowing they'd be completely dependent on me and I worry enough for myself. I'm sure they're a bit disappointed with my answer but it's my truth.
For now, I guess we keep on keeping on :) Have a great weekend and enjoy yourself!