I have a mortgage in a family members name, although the deposit and agreement of this property is mine. I would now like to take on the mortgage as the property is rented and tenanted and more than covers its mortgage repayments and makes profits.
As i am of retirement age could i secure a mortgage under the buy to let mortgage scheme ?
I would also like the existing mortgage in my name. Is this possible?

Without further information, I can't give you a definite answer, however I can give you some more general information.

Firstly, regardless of your age there will still be options available to you for BTL mortgage finance. It may be a requirement that you have some form of income yourself, even if it is pension income, but the fact that you are of retirement age does not in itself imply that you can't get a mortgage.

As for having the mortgage in your name, the mortgage must be in the name of the person who owns the property, so for you to have the mortgage in your name, your name must also be on the _title_ deed for the house.

For further information more specific to your personal circumstances, have a chat with an independent mortgage broker who will talk you through all of the options available to you and offer you some solutions to your problem.