Dear ANNONYMOUS ,
As you are old member of EPF, EPFO has generated your UAN.
To get the benefit of the EPS, you need to provide Aadhaar. If you leave this present job and joined another establishment, new employer will ask for Aadhaar no, failing which he will not be able to link your UAN to present employer, as result, cannot pay the contribution to RPFC.
IF you retired in the same establishment, on the date of retirement for getting the pension, you need to give Aashaar no linked to UAN, failing which not able to withdraw EPS as service is more than 10 yrs. If less than 10 yrs service, may be able to withdraw the EPS.
Thanks,
Vidyadhar Bhat