Sorry I'm new- I looked around but I know nothing about science, so I don't even know which category this would fall under!Anyways-- I'm interested in regeneration, I'm wondering why our bodies age, and what theories there currently are in regenerating tissue or other material- regrowing an entire limb for example.. Or just keeping your cells youthful!Anybody have any information for me??I keep thinking- if our body only takes so long to fully heal (what is it, 7 years for lungs?)Couldn't we.. Theoretically, keep them young/healthy for as long as we wanted?