Just because your hearing aids are no longer under the manufacturers warranty doesn’t mean they are beyond economical repair. Hearing aid manufacturers generally give between two and five years warranty after which repairs (if they still do them on the technology level you have) are chargeable.
At AJC Hearing we use a local hearing aid repairs centre that can fix hearing aids from all major brands at reasonable prices. Sometimes a brand has said “We no longer support that technology level as we no longer have the parts” and our supplier has still managed to repair them.
Even if you are purchasing new hearing aids, it is always a good idea to keep one of your older sets in good working order. You never know when you may need them for an emergency.