"But what about this century? The time we are in now.
If we don't write songs about this age what will our ancestors learn about how we lived now ?"

I don't normally turn to traditional songs to learn about how my ancestors lived - they tend not to be very useful sources of information (although they may occasionally illuminate the historical record).

"You can't be fixated by the past. We have to move on."

I feel fairly relaxed about being 'fixated on the past' - especially as a large majority of people in our culture seem to be fixated on ignoring or rejecting the past.
Previous attempts at updating traditional music seem to have consisted of turning it into rock music - and, as I have said previously, we've got far too much rock music in our culture as it is.