When is the optimal time to change career?

The whole experience of changing careers has actually taught me that there's no such thing as too early, too late... There's no expiry date on this. Lifelong learning has been a concept for a long time, is gaining traction and momentum as we go, who's to say, in another sort of 10 years, I won't decide, "Actually, now I'm ready to try something else", and that's okay and actually really exciting to think about. It doesn't mean that I'm dissatisfied right now, but I think it suddenly makes the sort of possibilities of what you could do for your career, for your job a lot more exciting, a lot more open.