What is the method for making up the days the questioner missed fasting in Ramadan since puberty, given that he does not remember their number? Is it true that whoever is unable to fast should feed sixty needy persons or fast for two consecutive months? And if that is true, does this mean he will fast for his entire life?

There are signs of puberty: a wet dream, or the appearance of coarse hair on the pubic area, or reaching a certain age (fifteen years according to the Shafi'is and Hanbalis, and eighteen years according to the Malikis and Hanafis for men, and seventeen years for women according to the Hanafis).

You must make up the days of Ramadan that you missed after puberty, along with paying an expiation for delaying the make-up, which is feeding one poor person for each day. If you cannot determine the exact number of days, then fast what you believe most likely clears your conscience.

Feeding sixty poor people is not correct, but if the breaking of the fast was due to sexual intercourse, then the expiation for intercourse becomes obligatory.