IPA: /ˈeɪɡlɒŋ/
KK: /ˈeɪˌɡlɔŋ/
Something that lasts for a very long time or throughout all of time.
The agelong beauty of the ancient ruins continues to attract visitors from around the world.
Agelong is formed from "age" (from Old French *age*, meaning a period of time) and "-long" (meaning extending over a distance or duration). The word "agelong" refers to something that lasts for a long period of time or throughout an age.
Think of 'age' as a long period of time and '-long' as extending over that time — that's why agelong means lasting for a long time.