Hi subby
When you reach State Pension age, your Carers Allowance will stop, your wife would still be eligible to claim CB ESA.
I would advise you to seek help from your local Welfare Rights Organisation who can take all your circumstances into consideration; You can find your local Welfare Rights Organisation to help you with advice by clicking on the link below and putting in your post code, it will then come up with a MAP with a list of agencies.
advicelocal.uk Gary