I know people who wear contact lenses successfully into their 70's and beyond.
Dear Riya0406,
One can use contact lenses for many years until it is difficult to put the lenses in your eyes. While there can be side effects, they have been used by many people for many years.
Dr. Feldman
Sandy T. Feldman, M.D., M.S.
ClearView Eye and Laser Medical Center
San Diego, California