I'm 34 and I just keep improving, coding since 10. The only thing you really need in this field is desire for constant improvement. And I'm not saying for you to study everyday, I'm saying that you should have that goal to every once in a while, could be weekly or even monthly, to look up something new.

Be open also for changes, we went from desktop applications to the web. Learn the technologies involved.

You need people with different backgrounds on the field though, just because I started very early, it doesn't mean that I don't respect or take to high regard somebody that would start coding on their 30s, but the opposite, they are important and valuable to have in a team. Developing software is much more than only programming and much less related to maths or olympic medals lol.

Nowadays there are so many materials and courses that makes getting into programming so easy, I had to go through many phases you just don't have to.

I've spent countless hours configuring servers in a way that nobody does anymore, using programming languages that almost nobody does, text editor configurations nobody use and so on. You'll never need to waste time with that. But once you are working 10+ years in the field, it will be expected from you that you learn new things.