What is the ruling on someone who broke their fast for five days in Ramadan four years ago and has not made them up until now?

Whoever delays making up the fasts they missed from Ramadan without a valid excuse until the next Ramadan begins is sinful. They must repent, seek forgiveness, fast the days they missed, and feed one poor person for each day. If the delay recurs for several years, the expiation (feeding) does not multiply with the number of years.