Will Allah forgive the major sins of a young man who is twenty-five years old?

Allah does not forgive that partners be associated with Him, but He forgives anything else to whom He wills. Allah Almighty has promised to accept the sincere repentance of the repentant. This is: abandoning the sin out of shame before Allah, regretting having committed it, resolving not to return to it, and disclaiming the right of its owner if it involved a human right. So, no matter how great the sins, sincere repentance wipes away sins, as Ibn Atiyyah said: "If we assume that a man repents to Allah with a sincere repentance that fulfills all conditions, then one can be certain that Allah will accept his repentance, as He has informed us about Himself, Glorified and Exalted be He."