Dear Rajesh,
The maximum number of years of service is 58-18 = 40 years. The maximum EPS wages are Rs. 15,000/-. If a member joins services upon completion of age 18 years, for example, in June 2001, and will retire in June 2041 without any breaks, and their average EPS wages are Rs. 15,000/-, at the present rate, their pension will be:
15000/70 * 40 = Rs. 8571/-
Thanks,
Vidyadhar Bhat