If the person resists your help, be patient and keep the following suggestions in mind. Remember that change is difficult, for everyone. Introduce changes slowly. Give him time to accept the idea. Admitting you need help is an admission that you are losing your abilities.
Denial is the great protector.
If at first you don't succeed, try again. Often if you wait 15 minutes and try again, your help will be accepted. Assure the person that he has a say in decisions about his care. You wouldn't like someone else to make all your decisions without consulting you. Offer a trial period.