There is an Olympic pole vaulter named Jenn Suhr. She started vaulting in 2004 when she was about 22 or 23, after training for 4 years, she won Silver in the 2008 Olympics, and gold in 2012. She is also only the second woman in history to vault over 5 meters. You have a huge selection of sports to pick, as long as you pick what you love to do and work hard at it you can go far.
Matt Scot (my former depute head boy) started playing rugby at the age of 16, he played for the Edinburgh u17s and u18s having had less than a year training at an amateur clubs then played for the Scottish u19s and u20s and is now part of the Scottish national rugby squad at age 22. I started athletics a year ago and currently enter lots and lots of competitions, it is possible in most sports you've just got to go for it.
Whether you can pick it up late is base on your work ethic and love of the sport. but no its never to late. Good luck get at it.
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