How does hair get to be so long?

The rate of scalp hair growth averages at 1 cm/month for a range of 2- 7 years and these are both likely to be heritable traits. When multiple genes, each with possible variations, are involved it is a polygenic trait like height. This means we see hair length in a continuous range of uncut lengths from short to long across the population but the majority will grow an average length.

This means populations have people who will grow hair faster than average and some slower than average and this may be a genetic trait. Similarly populations tend to have members who inherit longer follicle anagen periods and others shorter growth periods.

This means a few people inherit long anagen periods and/or faster rates of growth making it possible for these individuals to grow exceptionally long hairs, if they get a good diet and protect the hair from mechanical damage. At the other extreme are those who get brief anagen and slow growth rates.

The wiki on it states that the longer it is in the anagen phase, the faster it grows. Personally I was able to grow my hair until just above my waist in three years without even trying. Perfectly possible if you're not unlucky with the genes and take good care of your hair (which you should do however long it might be ^^).

No idea lol. I know you can take vitamins to make your hair grow though