There were 3 boy Alexs in my class at school (I'm 27)
Also an Alexandra (Alex for short). And an Alix (girl) I knew.
I once had a boyfriend called Alexander.
There were two in my halls of residence. Both male, one called himself Axel and one Xander.
Friends of my family have a 10 year old Alex. Other friends of the family have a 17 year old Alex.
My nephew is Alex (he is 21 months).
There is a 4 year old Alex at my DD's nursery.
I know THREE 3 year old Alexanders, a 1 year old Xander, and a newborn Zander.
My yoga teacher's little boy is called Alex, but I don't know his age. My DD's swim instructor is Alex (feamle, early thirties)
I can think of about 20 off the top of my head.