I don't see
Derek as being that old, it's someone in their 30's-50's to me, as it had quite a leap in popularity in Canada from the late 60's to the late 90's.
It is a fine name, not my favourite, but solid and handsome. There is nothing wrong with
Derek.
I have a cousin
Derek whose siblings are
Cody and
Jacob.
I'd pair
Derek with something else that reminds me of the same time period but with a somewhat timeless feeling,
Brandon,
Peter,
Patrick, etc.