Is 62 kg healthy for a 14 yr old girl?

it depends on your height. If you're somewhere between 168cm- 177cm , then Yes It's a good weight. But again you should count your BMI to know whether it's a healthy weight for you (your BMI should be from 19 to 24).

I am 175 cm tall , my wight is 62 kilos , my weight is just healthy and good enough for me (and I'm also 14 yrs old :)