To demonstrate the measures I have uncovered, I will use several aged Hammerhead paper airplanes to demonstrate various features that increase the abilities of aged airframes. The benefits of these features are not limited to the Hammerhead, but it is more versatile and able to have these add-ons applied with ease than several other aircraft. The add-ons are independent of one another, but incurring all 5 can be favorable for certain requirements.
Step 1: Materials
Aged Paper Airplane Airframe (Hammerhead airframes pictured)
Step 2: Un-taping, Unfolding, Refolding And Re-taping
2.) Once all of the tape is off, do the steps for constructing the aircraft in reverse (for the Hammerhead, go from Step 8 to Step 1). Once you've gotten it down to its sheet form, remake it back into its airplane form and tape it.
The objective of doing this to clear any debris out of the airframe that might have gotten lodged in it.
In some cases, this is the only step needed to bring an aircraft back up to the same standard as a new one.