Signs that new roof is needed

[skbohler]

Hello,

Our roof is about 30 years old. It's got some lichen over a good portion of it and there is some moss at one point where two levels meet to create a "V".

There's no leaking anywhere that I can detect. Should I put a new roof on regardless? Aside from water leaking in, what are the signs that it's time for a new roof?

Thanks in advance!

Steve

[pgtek]

if
the end of the shingle tabs are curl
lost of granulated surface
worn spots between the tabs
pin holes between the shinles tab
break of easy when walikng over them