On average, boys stop growing around 18/19 and girls around 16/17 after Puberty has finished and the growth hormones no longer produce. This is when they have aquired a full reproducing adult body. Of course there are many exceptions, but it is the case that the average girl reaches her full adult height and build a couple of years before a boy reaches his.
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Usually around the age of 30 or late 20's. you will find that then after your feet wont grow dramatically or keep going up in sizes!!
Feet usually start adult growth around puberty as hormones are kicking in.
Hands should stop growing when the rest of your body stops growing. For men this is around 19-22 years old, for women it's usually early to mid teens.