Is it obligatory to make up for missed prayers spanning 25 years due to negligence, and how are the years of making up calculated if the age of puberty is unknown, and are good deeds performed during the period of not adhering to prayer accepted?

You must preserve your prayers and repent from being lazy about them. He who neglects prayer is more neglectful of other things. The majority of scholars agree on the obligation to make up missed prayers, and these should be made up from the age of puberty. If you are unsure about the age of puberty, consider it from the completion of 15 lunar years. As for other good deeds performed during the period of neglecting prayer, their reward is hoped for.