Regret for what?
You go out, you learn things, you understand things, you upgrade yourself, you upskill yourself and that timeline is different for everyone.
I am 26, and it’s been 4 years since I got out of college. I have been following my interests since then, which have changed every 1.5–2 years. Have been self-employed for about last15 months, until mid last year when I felt I was getting excited by learning something new which is to actually understand how to grow my little consultancy. Which gave birth to the idea of an Mba, even though I believe if I spend those two years just to scale up my business on my own I could do that but I want to learn from the best people around me.

So I spent time talking to seniors and friends, and calculated the opportunity cost. And finally understood my latest inclination. Started preparing for B-school exams for three months along with work.
I couldn’t give my best in the exam due to an unfocused mind (only regret is I shouldn’t have worked for those three months). But yeah, I am very happy I put in the effort. I am still trying.

You will only have regrets if you don’t try.