Hello i have 16 years old and i found out that i have klinefelter syndrome . should i do trt? if yes then when ? asap or wait few years? plz?

Yes, you should receive testosterone treatment and it should start now. By UPTODATE: "For boys 13 to 18 years, the goal of testosterone therapy is to cause gradual virilization (eg, facial and pubic hair, muscle development) without inducing early closure of bony epiphyses and decreased growth and height". Use low dose until growth ceases or until age 18-19 years.