Cycle length.

Tiffany
I quit taking BCP's 6yrs ago.  After about a year my cycles regulated,  and my periods became very short.    Like I only have bleeding 1-2days and then brownish spotting for about a day sometimes 2.   I never thought much about it untill I started reading about fertility. 
Does anyone else have similar short periods, is this normal?  Is it because I'm older now (34)?
Should I be concerned?