I guess it does not affect our life expectancy, depending on how much stress you actually applied to your body. Let's have it like this, I have met this tall mexican guy who played basketball in my school, during his development he managed to break his knee in some way. It was so bad that it stopped growing and they had to limb lengthen his legs in order to make them be paired. He was growing excessively! He might be like 6'5" right now idk. My point is, we are not the first persons doing LL, and LL is also done in dwarf persons, kids who get their knees plates broken, or any person in general who breaks their legs. However, I guess it depends more on how much STRESS you applyz If you go from 5'8" to 5'11", if much 6'0" probably there wasn't much stress done. But in my case, if I am willing to go from 5'1" to 6'0" them my body won't even support it and I might die right away after the treatment is done. Probably I am exaggerating but it does depends on how much you are forcing your body to grow is what I mean. If yo uchoose to grow 3-4 inches then probably you aren't harming that much your body. Also, the younger you are, the best. Why? You produce more HGH during your youth years, even if you are done growing like me, you keep producing a lot of HGH. It will start to decrease during your mid-late 30s though so just be sure to do LL as soon as possible that is why I want to do it now that my plates have been right away closed... but I am still hoping for a miracle (yeah sure...)