Is it obligatory to make up for missed fasts from the age of puberty (13 years) until the age of 27?

We congratulate the questioner on the blessing of guidance to commit to prayer and fasting and to grow a beard, and we ask Allah for his steadfastness. It is clear that abandoning prayer and fasting is not a light matter; prayer is the second pillar, and abandoning it out of denial is disbelief, while abandoning it out of laziness is severe transgression, and it is not permissible to abandon it no matter one's state. Fasting is a pillar that should not be abandoned except with a legitimate excuse. Sincere repentance and maintaining prayer and fasting in the future are obligatory, as is making up for missed prayers and fasts from after puberty. It is permissible to make up for prayers at any time.