As of this year, according to these statistics , there are only 697,806 U.S. Vets still alive. The number dwindles every year. Good info at this site.
WWII Veterans Statistics - The National WWII Museum
How many WW2 veterans are alive ? U.S. forces?
In 2014 there were 88,400 Canadian Veterans of WWII alive, but were estimated 55 die each day (at that time)
If I remember correctly the last US WW1 vet died recently