1
general::
Now, in the present, as in In this day and age divorce is a very common occurrence. This phrase is redundant, since this day and this age both mean "now". [Early 1900s]
American Heritage Idioms
2
general::
Phrase(s): in this day and age
Fig. now; in these modern times. • Bill: Ted flunked out of school. Mother: Imagine that! Especially in this day and age. • Bill: Taxes keep going up and up. Bob: What do you expect in this day and age?
McGrawhill's American Idioms And Phrasal Verbs