Derek Moran
104. Bicyclists to wear helmet
(2.1) Subject to subsection 103.1 (2), no person shall ride on or operate a bicycle on a highway unless the person is wearing a bicycle helmet that complies with the regulations and the chin strap of the helmet is securely fastened under the chin.
..interestingly enough- there is NO definition for PERSON in the Highway Traffic Act.....but there is in the Legislation Act, 2006 ;)
http://www.e-laws.gov.on.ca/html/statutes/english/elaws_statutes_90h08_e.htm#BK167