Geesh. I was 18 and came down with it. I did not get it from kissing either.
My sister also came down with it and she had six relapses!!!
I got it at 16, probably from someone at the restaurant where I after-school waitressed. It sure wasn't from kissing, but I had a hard time convincing my parents of that!
My seven year old son had it.
The weird thing is, my then fiance did NOT have mono and didn't catch it from me; he never was ill at all. I have NO idea how on earth I got it.
I had it at 26.Almost died too.Had a 104 degree fever for days and had to go to the hospital for a spinal tap.I remember my parents had to peel the soaking wet night clothes off of me twice a night for a week.
Back then I had let my body wear down totally-late nights,drinking,bad food,etc.After that I started on vitamins and better food and it has made all the difference.