At 72k miles they may be due for replacement, but may also be fine; try the fuel flow test and see what numbers you get.
I'm at a tad under 190,000 miles; I replaced the original MAFs at around 80-90k and noticed some improvement. Cutting a long story short, I had a brief experience (10-20k miles) with VW MAFs that I thought were originals and they made my car sluggish. I spent quite a while trying to work out what was wrong before I took the MAFs out and noticed the different part number. I put original set number two back in (they now have around 90-100k on them) and the car is still performing well; it pulls around 140-145 L/H on the fuel flow test.