Mid-Late flowering question.

Hi,
Just a quick question....
Is it normal/abnormal for lower leaves to start looking a bit pale and dying off as flowering progresses (approx 3 weeks to go) ....?
Asking as I'm sure I read that this is normal, but i've looked and can't find article.

I could post a pic if that's req'd, just not tonight...

Any help would be appreciated....

Perfectly normal for many strains.

Although you might want to check the tips of your upper leaves - if you don't have any nute burn at all a nitrogen deficiency could be responsible. Are the upper leaves light green?