Texas Government Code - GOV'T § 852.105. Optional Prior Service Credits

(a) The governing body of a municipality that has an effective date of participation in the retirement system before September 1, 1987, and that allows service retirement of a member at age 60 or older with at least 10 years of credited service may by ordinance allow prior service credit for service performed for the municipality before September 1, 1987, by any person who at the time of performing the service was not a member because at the time of employment the person's age exceeded the maximum age for becoming a member.

(b) A governing body may not adopt an ordinance under this section unless the actuary first determines, on the basis of mortality and other tables adopted by the board of trustees, that all obligations of the municipality to the benefit accumulation fund, including obligations proposed under the ordinance, can be funded by the municipality within its maximum contribution rate and within its amortization period.