Well, I learned when I was 27
I was afraid first and tried to ride on small distances in a yard but it didn't work. You need space. One day I have tried on the street and I couldn't believe myself that I was riding. Btw it was a neighborhood street with almost no traffic. I stopped if a car was coming. It might help if the street is gentle slope downhill.
Ah, I learned the hard way that I need to...use the brakes.
In time, about a couple of months, I became better and better to guide the bike through small openings and keep my balance.
Now I am a pro.