In Jain tradition, each of the 24 Tirthankars of the present time‑cycle (Avasarpini) has a specific lifespan (age) given in the scriptures. These ages are very large for the earlier Tirthankars and gradually decrease as time moves forward.

Below is a simple list of the 24 Tirthankars with their traditional ages (mainly Śvetāmbara numbers; Digambar tradition has small numerical variations but the same decreasing pattern):

1. Rishabhdev (Adinath) – 8,400,000 purva
2. Ajitnath – 7,200,000 purva
3. Sambhavnath – 6,000,000 purva
4. Abhinandannath – 5,000,000 purva
5. Sumatinath – 4,000,000 purva
6. Padmaprabhu – 3,000,000 purva
7. Suparshvanath – 2,000,000 purva
8. Chandraprabhu – 1,000,000 purva
9. Suvidhinath (Pushpadant) – 200,000 purva
10. Shitalnath – 100,000 purva

From here onwards the unit is in years (human‑type years):

1. Shreyansnath – 8,400,000 years
2. Vasupujya – 7,200,000 years
3. Vimalnath – 6,000,000 years
4. Anantnath – 3,000,000 years
5. Dharmnath – 1,000,000 years
6. Shantinath – 100,000 years
7. Kunthunath – 95,000 years
8. Aranath – 84,000 years
9. Mallinath – 56,000 years
10. Munisuvratnath – 30,000 years
11. Naminath – 10,000 years
12. Neminath – 1,000 years
13. Parshvanath – 100 years
14. Mahavir Swami – 72 years

Important points to understand

• “Purva” is an extremely huge Jain time unit, far, far greater than a year. So the ages in purva are beyond normal imagination and belong to very early eras of the time‑cycle.
• As time progresses in Avasarpini (descending half‑cycle), the age, height, and strength of humans continuously decrease. That is why the first Tirthankars have unbelievably long lifespans, and by the time of Parshvanath and Mahavir Swami, the ages are close to what we call “historical”.
• Both Digambar and Shvetambar accept:

- The order of the 24 Tirthankars - The decreasing pattern of ages - That Bhagwan Mahavir lived 72 years They may differ slightly in some exact numbers or historical dating, but not in the core idea.

If you want to see this in more detail and in simple language, you can also refer here: You can read more here