How did the barber deduce information about Raju's life?

The barber was able to deduce a great deal of information about Raju's life. The barber knew that his barber shop was the first one outside of the jail. He also noticed that Raju's hair and face showed it had been a while since they'd been taken care of, but not so long that Raju would have been in jail for a very long time. He also noticed that Raju didn't have the hardened look of someone who had been in jail long for a severe crime like murder.