The bonds of each issue shall be dated, shall bear interest at such rate or rates not exceeding 7.5 percent per annum, shall mature at such time or times not exceeding 50 years from their date or dates as may be determined by the county commission, and may be made redeemable before maturity at the option of the county at such price or prices and under such terms and conditions as may be fixed by the county commission prior to the issuance of the bonds.
Fla. Stat. § 153.06