In Jain cosmology, Devas (devtas) live in Devaloka and are beings of merited karma. Their lifespans are much longer than that of humans, but the exact numbers differ across texts and traditions (Digambar and Shvetambar). Key points:

• Devas are born into celestial realms due to their punya (merit) from past lives, not by exertion or choice.
• Their lifespans are described as vastly longer than human lifespans. Some passages speak of thousands of years, but the figures vary by text and school.
• There isn’t a single uniform reckoning of ages. Different Jain scriptures and sects give different numbers for how long various classes of devas live.
• In general, the emphasis is on the transient nature of all worlds, including Devaloka, and the moral purpose of striving for liberation (moksha) rather than fixating on celestial longevity.

If you’d like, I can summarize how Digambar and Shvetambar sources differ on specific deva subclasses and their lifespans, and provide the exact Sanskrit stotra/sutra references ( arth ) from authentic Jain texts.