Orcs seem to have lifespans based on how famous they are. Azog lived to be at least 319, but died through combat at the Battle of the Five Armies. No definite age is given, only how long he ruled Moria. Bolg lived to be at least 150 years old. The Uruk-hai(Saruman Breed) were months/years old. And some orcs(hinted at, with no evidence) spent their entire lives in Minas Morgul, which spanned several human generations. And in the behind the scenes(RotK, I think) one of the modelers on the tower made the mention of having orcs live for 100-150 years, then a new set would begin a new set of construction on Barad-dûr. So if you look closely, the CG model of Barad-dûr has a different look all the way up the tower.
Really infamous orc: Possibly 500 years, at least 319
Known orc: 150-200 years
Peons: ~100 years
Uruk-hai(Saruman Breed): 3-4 years
 - Tolkien, The Hobbit, ch. 1: "An Unexpected Party".
 - Tolkien, J. R. R. (1937), in Douglas A. Anderson, The Annotated Hobbit,
 - I am unable to locate an internet source for this bit of information, or an exact
time stamp since my DvD player reads 19:99 at anything over 20 minutes.