My dad did something similar about age 70. Bought a new hybrid and broke his wrist riding it on the second day. The bike sat in his garage for two years, until he said "What should I do with my bike?" "I'll take it" was my quick reply.
Swapped all the new parts onto my heavily used 10 year old hybrid. Rebuilt the "new" bike with all the used parts. Gave the "new" bike to my son to take to university. He got through the year riding it around campus, then had it stolen about exam time. Not a big loss. He now rides the "old" hybrid with the new parts and is very happy with it. And I have 2 really new bikes.
If your noob buddy doesn't know what to do with his bike, pass it on to some pennyless student. And good luck on the broken hip. They are no fun.