you need to have this one year of work experience in the last three years at the time you apply. If you retired September 2015 - you are cutting it insanely close
I think you have this mixed up, Scylla. You need 1 year work experience in the last 10 years. Only Canadian work experience needs to have been acquired in the last 3 years.
http://www.cic.gc.ca/english/immigrate/skilled/apply-who.asp