My car ran for right around 63,000 miles with a leak in the intake tract after the MAF and before the turbo where it was hard to see. It sucked in enough dirt and [censored] over that time period that I had to fill my intercooler with gas about seven times to get all the dirt out. My head breather hoses were full of gritty, oily gunk. My car sees a super high dust environment every day I go to work (park near a construction site). This car sees lots of short trips, lots of highway miles, and lots of 6000 RPM.
It doesn't consume oil at an alarming rate (Mobil 1: ~1 quart/5000 miles, Rotella T6: ~negligible, 15w40 anything: none), the turbo isn't OMGDEAD, it's not making any weird noises, and I have no reason to suspect it won't last as long as any other WRX.
Oh, clean your MAF. It's probably dirty from those 70 miles.