Here is the best quote I found after a brief Google session on this subject:
"Side Effects From Long-Term Use of Steroids
Side effects that may be caused by the long-term use of steroids include cataracts, muscle weakness, avascular necrosis of bone and osteoporosis. These usually do not occur with less than four weeks of treatment.
Avascular necrosis of bone, usually associated with high doses of prednisone over long periods of time, produces hip pain and an abnormal MRI scan. It occurs most often in the hip, but it can also affect the shoulders, knees and other joints. Caught early, the joint can be saved by "decompression" by an orthopedic surgeon. Once full developed, Avascular necrosis is painful and often requires surgical joint replacement for pain relief."
Whether or not the 2 friends who took steroids in their twenties decided for themselves that it caused their hip problems, or whether a doctor did, is not clear. It is possible, if they took enough for long enough. It should also be noted that anabolic steroids and corticosteroids have some differences in their long term effects.
I found nothing to suggest that a 1 or 2 week tapered dose treatment, as typically used to treat acute symptoms, has this kind of long term effect.
Steve