Whens the last time anyone has checked??

Whens the last time anyone has checked??

What you cant see -might hurt ya  - This is a spit in a rubber boot for a plumbing vent going through the roof.  That opening can allow water to enter the home structure and can cause the growth of biological substances. Roof flashings need to be checked regularly - as you see in the picture a sealant was applied - but sealants are mostly a TEMPORARY fix..
Dont forget to have it checked up.