and not be anything to worry about. Periods
can be closer together
, (shorter intervals in between), further apart (skipping months...perhaps, several), heavier, lighter....and everything in between.
The only "constant" during perimenopause is "change". :)
And, no 48 is NOT too young to be having this type of thing happen. Perimenopause can start anytime during our 40's (sometimes, late 30's) and last between 3 and 10 years.