Would you change your iPhone 5 for a 5s?

I'm a 14 years old guy, I can make my own money, but my mother and father always tells me. ''If I do not need something, I do not have to buy it''.

I have an iPhone 5 and I do not know if I have to change it for a 5s or keep it with me until next year.

If you were me. Would you buy it or keep it until next year?