This is an excellent article from Classical Guitar Magazine, worth a read for any doubters out there!

http://classicalguitarmagazine.com/its-never-too-late-to-start-starting-to-play-guitar-as-an-adult-has-unique-challenges-and-opportunities/?utm_source=Classical+Guitar&utm_campaign=53fe92378f-CGN_News_09_09_169_6_2016_COPY_01&utm_medium=email&utm_term=0_c03d2c9fc3-53fe92378f-212244701&mc_cid=53fe92378f&mc_eid=da5df12584