Cheryl Schatz

Martin,
Here are a couple:

Inscriptional Evidence for Women as Leaders in the Ancient Synagogue: SBLSP 20, ’81, 4; B’s rendering: ‘Here lies Sara Ura, elder [or aged woman]’;
Arndt, W., Danker, F. W., & Bauer, W. (2000). A Greek-English lexicon of the New Testament and other early Christian literature (3rd ed.) (pg 863).

Below is the meaning of the word with #2 as just the female version, but would have the same meaning just feminine:

A. Nouns.
1. presbutes “an elderly man,” is a longer form of presbus, the comparative degree of which is presbuteros, “a senior, elder,” both of which, as also the verb presbeuo, “to be elder, to be an ambassador,” are derived from proeisbaino, “to be far advanced.” The noun is found in Luke 1:18, “an old man”; Titus 2:2, “aged men,” and Philem. 9, where the RV marg., “Paul an ambassador,” is to be accepted, the original almost certainly being presbeutes (not presbutes), “an ambassador.” So he describes himself in Eph. 6:20. As Lightfoot points out, he is hardly likely to have made his age a ground of appeal to Philemon, who, if he was the father of Archippus, cannot have been much younger than Paul himself See OLD.
2. presbutis the feminine of No. 1, “an aged woman,” is found in Titus 2:3.
Vine, W. E., Unger, M. F., & White, W. (1996). Vol. 2: Vine’s complete expository dictionary of Old and New Testament words (20).