I think on average the female body stops growing in height between 16 to 21 but hips can change depending on the factors...weight gain/loss, pregnancy etc...
My best advice is if u are wanting them to stay close to the same as they are now...stay active and exercise if you have no medical reasons not to and set yourself into a lifestyle of health eating habits (not so much "dieting") I wish someone had told me when I was young that the real secret to a healthy body was to start when you were young . Hope this helps
Oh and as for breasts...the same with them...it depends on the changes ur body experiences in some cases...By the time I was 30 I had a G cup I think thats when mine finally stopped growing lol but some people stop much earlier. Try not to worry too much about it now unless it poses a health risk to u. If you are worried because u feel inadequate...there is someone for everyone...you are young and there really is no rush :) I do understand most of us feel that there is at that age though :)