While a myriad of effective techniques exist to aid in symphyseal age estimation for those 40 years and younger, few offer similar levels of efficacy for those beyond that threshold. To remedy this, the Composite Method, or "TCM,” utilizes five distinct areas of interest, plus a correction for density. During testing, the TCM accurately estimated age 87.75% of the time (averaged amongst four observers [spread: 72–100%]) for a subset of 50 living British females. An adjusted R2 value of 0.85, an RSME value of 5.62 years, and a PCC value of 0.92 also confirmed the technique to be a good predictor of age for the entirety of the larger female sample (n = 533). Low inaccuracy (3.86 years) and Bias (0.69 years) further indicated that a continuum-based approach, without pre-set phases or ranges, such as that employed by the TCM holds the potential to be as effective as the currently available methodologies but with the added advantage of allowing for increased variation at the individual level. Age estimation by linear regression, or by simple addition, yielded estimation envelopes (intervals) of 22–23 and 24 years, respectively, which remain narrow enough to be forensically useful while still wide enough to maximize accuracy in mature adults.