height over age

Of course! At 19 my best guy friend had to get surgury on his knee and his doctor said he was still growing and he's about 6 something.

Yes, absolutely, you can and often do get taller after the age of 17. I know lots of guys that I went to high school with who were shorter are now almost 6 footers. Some of them even said they didn't get that final growth spurt until they were in their 20's (which surprised me to hear.) I have cousins, etc, that grew more taller after 17 too, so I'd have to say that yes, you can gain more height after 17.