In the tree cricket, Oecanthus henryi, males invest in long-distance acoustic signals which the females use to identify and localize conspecific mates. Males that live and call longer or louder are expected to have higher mate attraction opportunities. O. henryi males with softer calls also exhibit an alternate signalling strategy called baffling. Baffling increases the sound pressure level (SPL) of the signal by 8-12 dB, thereby increasing their mate attraction potential. Interestingly, most call features in O. henryi, including SPL, show a low across-night repeatability, indicating immediate condition-dependence. Nutrition and age can contribute to immediate male-condition. Therefore, in this study we investigated the effect of diet on male longevity and the interaction of diet and age in determining lifetime male calling propensity & calling duration in a semi-natural set-up. In concordance with our expectation, males on high-nutrition lived longer, had a higher lifetime signalling and had longer within-night calling duration. We, moreover, studied diet-dependent phenotypic senescence of male acoustic signals. Males on high dietary-condition sustained their high signaling activity while males on poor dietary-condition suffered a sharp decline in signaling. We also examined how nutrition & age affect non-baffling SPL and consequently, baffling behaviour. We hypothesized males on poor diet-condition to have lower non-baffling SPL and hence, higher baffling probability. We also expected to find similar pattern of age-dependent decline in non-baffling SPL and consequent increase in baffling probability. We, however, did not find any effect of diet and age on signal SPL and baffling probability.