Well, any age after puberty.
My guy friend told me he was almost approached by two
"aunties" at Geylang while he walked by the lorong something
something (he was searching for a buiilding to meet his
friends).
While he briskly walked by them, he can hear one of them
psychoing the other aunties to approach them. :"go ask them if they
want leh"
.... eeee.