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We report the discovery of a 1.32$^{+0.10}_{-0.10}$ $\mathrm{M_{\rm Jup}}$planet orbiting on a 75.12 day period around the G3V $10.8^{+2.1}_{-3.6}$ Gyrold star TOI-5542 (TIC 466206508; TYC 9086-1210-1). The planet was firstdetected by the Transiting Exoplanet Survey Satellite (TESS) as a singletransit event in TESS Sector 13. A second transit was observed 376 days laterin TESS Sector 27. The planetary nature of the object has been confirmed byground-based spectroscopic and radial velocity observations from the CORALIEand HARPS spectrographs. A third transit event was detected by the ground-basedfacilities NGTS, EulerCam, and SAAO. We find the planet has a radius of1.009$^{+0.036}_{-0.035}$ $\mathrm{R_{\rm Jup}}$ and an insolation of9.6$^{+0.9}_{-0.8}$ $S_{\oplus}$, along with a circular orbit that most likelyformed via disk migration or in situ formation, rather than high-eccentricitymigration mechanisms. Our analysis of the HARPS spectra yields a host starmetallicity of [Fe/H] = $-$0.21$\pm$0.08, which does not follow the traditionaltrend of high host star metallicity for giant planets and does not bolsterstudies suggesting a difference among low- and high-mass giant planet host starmetallicities. Additionally, when analyzing a sample of 216 well-characterizedgiant planets, we find that both high masses (4 $\mathrm{M_{\rm Jup}}$$<M_{p}<$ 13 $\mathrm{M_{\rm Jup}}$) and low masses (0.5 $\mathrm{M_{\rm Jup}}$$<M_{p}<$ 4 $\mathrm{M_{\rm Jup}}$), as well as both both warm (P $>$ 10 days)and hot (P $<$ 10 days) giant planets are preferentially located aroundmetal-rich stars (mean [Fe/H] $>$ 0.1). TOI-5542b is one of the oldest knownwarm Jupiters and it is cool enough to be unaffected by inflation due tostellar incident flux, making it a valuable contribution in the context ofplanetary composition and formation studies.

An old warm Jupiter orbiting the metal-poor G-dwarf TOI-5542