Videos Watch: 82-year-old On Why He Loves Mountain Biking By Video Share January 11, 2019 Alf is an 82-year-old who started mountain biking at 70 years of age after recovering from cancer. This is his story. Share This: Tweet Video Share These are videos that the Singletracks Staff has collected from around the internet and have deemed worthy to share with you. Subscribe! Enter your email address to receive our top stories via email each week.