If you became profoundly deaf after you developed spoken language skills, then a cochlear implant might be suitable, but this is not the case for everyone.
If you are an adult who has been deaf from birth, or before learning to speak or understand language, a cochlear implant may not suit you. This is because it is better to have some memory of sound in order to make sense of the signals provided by the implant. However, some adults who were born deaf or who became deaf at a young age can gain considerable benefit from a cochlear implant, provided they have tried hearing aids in the past and are keen to hear.
If you get sufficient benefit from modern high-powered hearing aids with well-fitting moulds, and you can follow speech quite well without lipreading, then you are unlikely to be considered for a cochlear implant.
You may get more benefit from your implant if you receive it soon after becoming deaf (<10 years). However, your age is not important when your doctors are deciding whether an implant will be suitable for you. It is important that you are in good health and able to undergo a major operation. If you have an implant, you will need plenty of support from your family, friends, and professionals, especially as you learn to use it.