Roofer says there are 8 existing roofs on a 60-year-old property

[Logan Allec]

...and wants to charge extra for each one.  Property is in Southern California just outside the LA city limits--generally mild weather conditions.  I find it unbelievable that there could be these many roofs on a building built in 1955, especially considering that the previous owner (who held the property since 1997) did not put new roofs on (the roofer does not know this), but then what do I know.  Here is his explanation:

"What I think happens is you're out here in the sticks, and when people have leaky problems they just they just roof over it each and every time.  The flat deck was an ongoing problem, and to fix it each time they roofed over the top so by doing the math thinking every 6.25 years they would roof over the top until now."

Is this possible?  Is there any way to independently verify that there are in fact 8 roofs sitting on this property?