My son had grommets and his adenoids removed at three and half years old. I feel that removing his adenoids really improved the quality of his life as he had a constantly runny nose before the operation. He had experienced 10 perforations before the operation.
However his grommets went very badly wrong. The grommets themselves fell out after 6 weeks, but they left holes which took 9 months to heal. Doing those 9 months my son had pus constantly dripping from his ears and smelt like a dustbin. The infection was anti biotic resistant and only cleared up once the perfortation healed. We were seeing the ENT consultant every 4 weeks for nine months!
When my son's glue ear returned we had the choice between extra large T-shaped grommets that would have to removed with a second operation or hearing aids. I chose hearing aids and my son had hearing aids for 18 months. Thankfully my son only has slight permament damage to the hearing in his left ear. His right ear compensates well and he has no problems at school.
Hearing aids are not as good as grommets for correcting hearing loss. Many children don't like hearing aids and they need to be retuned regularly as the pattern of hearing loss with glue ear flucates so much.
I feel that many parents push hard for grommets without understanding the risks. Our ENT consultant became very reluctant to do grommets on any child after seeing my son.
In our area the ENT consultants are quite dishonest to parents. They don't explain why they have chosen to do watchful waiting and pretent that their child is on a "two year waiting list". When my son had his grommets he only had to wait 6 weeks as he had such a bad hearing loss.
It can be interesting to see the audiograms for both ears. If the pattern of hearing loss is different in both ears then it can be possible to hear all the frequencies of speech.