Rare to grow at 20: Most men stop growing around age 18- but occasionally some will grow until age 21 or so, but if so, not much more. Taking measures to increase your production of growth hormone might help, but if your growth plates have closed (like most 19 yo's) then you've reached your max. See "http://www.thebodywellusa.com/blog/dr-mike-carraghers-top-10-ways-to-increase-your-human-growth-hormone-hgh-levels".
Answered 9/24/2015
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