Great post and responses!! I too am an older man and concerned about SD. I been carrying knives all my life but dont think i could use them to save my life. Years ago i found a C2 taser gathering dust in a gun shop and made a great deal. Now it goes with me everyday. i also added the Kimber pepper spray to my EDC. As far as riding your bike i would suggest a Spitfire spray. it has a break away key ring attachment that could be used on a lanyard around your neck. Above is correct...distance from an attacker is your best asset. Having a backup plan is always a good idea. my 2 cents.