2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/186799We use low-degree acoustic modes obtained by the BiSON to estimate the main-sequence age $t_\odot$ of the Sun. The calibration is accomplished by linearizing the deviations from a standard solar model the seismic frequencies of which are close to those of the Sun. Formally, we obtain the preliminary value $t_\odot=4.68\pm0.02 $Gy, coupled with an initial heavy-element abundance $Z=0.0169\pm0.0005$. The quoted standard errors, which are not independent, are upper bounds implied under the assumption that the standard errors in the observed frequencies are independent.6 pages, 4 figures, in Stancliffe R.J., Dewi J., Houdek G., Martin R.G., Tout C.A., eds, AIP Conf. Proc., Unsolved Problems in Stellar Physics. American Institute of Physics, Melville, in the pressAstrophysicstext