Hello, i am from Poland, i am new and i have 15 y.o 
15 y.o? What does it mean? 
But well, welcome to the forum and a happy new year
I hope your active 
~Pimorez
It means “15 years old” 
Welcome to the forum!
Yes, X-Kal, thank you, that was mean 15 years old./ And Happy New Year Too :] For Everybody
Happy New Gregorian Year! (Hehe, I follow three calendars now - it’s insane)