-age

1.
a suffix typically forming mass or abstract nouns from various parts of speech, occurring originally in loanwords from French (voyage; courage) and productive in English with the meanings “aggregate” (coinage; peerage; trackage), “process” (coverage; breakage), “the outcome of” as either “the fact of” or “the physical effect or remains of” (seepage; wreckage; spoilage), “place of living or business” (parsonage; brokerage), “social standing or relationship” (bondage; marriage; patronage), and “quantity, measure, or charge” (footage; shortage; tonnage; towage).
Origin
Middle English < Old French < Latin -āticum, neuter of -āticus adj. suffix; an extension of Latin -āta -ate1, whose range of senses it reflects closely
British Dictionary definitions for -age

-age

suffix
1.
indicating a collection, set, or group: acreage, baggage
2.
indicating a process or action or the result of an action: haulage, passage, breakage
3.
indicating a state, condition, or relationship: bondage, parentage
4.
indicating a house or place: orphanage
5.
indicating a charge or fee: postage
6.
indicating a rate: dosage, mileage
Word Origin
from Old French, from Late Latin -āticum, noun suffix, neuter of -āticus, adjectival suffix, from -ātus-ate1 + -icus-ic
Word Origin and History for -age

word-forming element in nouns of act, process, function, condition, from Old French and French -age, from Late Latin -aticum "belonging to, related to," originally neuter adjectival suffix, from Latin -atus, pp. suffix of verbs of the first conjugation.