The six letter word

I am a family.

A member of me is so cute.

Drawing my last four over my first two might perish this age.

My counterpart makes a letter and a number.

What am I?

I'm pretty sure you are a

Feline

I am a family.

I think the family of cats is Felidae but can is also referred to by the adjective feline.

A member of me is so cute.

Drawing my last four over my first two might perish this age.

Drawing a line over Fe (iron) might perish this age - as clarified by the OP, this refers to $$\overline{Fe}$$, the anti-matter counterpart of iron which could cause us to perish (originally, I had thought this referred to the end of the Iron Age or the elimination of iron, in general).

My counterpart makes a letter and a number.

My counterpart might be a canine or K9, for short.

• I though of the last one as the answer!
– m4n0
Oct 3, 2019 at 9:11
• Correct! Great job. Oct 3, 2019 at 9:12
• rot13(Gubhtu sbe gur yvar bire "Sr" guvat, V vagraqrq na bireyvar, vaqvpngvat gur nagvznggre pbhagrecneg bs veba.) Oct 3, 2019 at 9:15
• @DannyuNDos Ah, I see, makes sense. Oct 3, 2019 at 9:16