When you have attained ten years of creditable service, you become a vested member of the retirement system.
This means that you have a right to receive a monthly annuity when you reach retirement eligibility. Even if you terminate employment before reaching eligibility, if you are vested, you can decide to leave your contributions in the system and begin drawing your annuity when you reach age 62, or when you meet other age and service requirements for retirement eligibility.
It is important to note that, although retirement contributions for inactive members draw interest, the inactive member's multiplier can increase during the years between the member's termination and retirement, but no cost of living increases are applied.