71 is not old, unless you make it so.
Think about your fear and work out which particular aspects of aging you are fearful of, then plan to minimise the effects of those.
Health? Get enough exercise and make sure your lifestyle doesn't include smoking, drinking to excess, an unhealthy diet, and so on. Go for all the checkups you are offered and be aware of the symptoms of the common ailments that are likely to hit you. But don't become a hypochondriac, concentrate on being well not on being ill.
Being alone? Keep on good terms with family and friends, and arrange to meet them as often as you can. Make new friends, with young people as well os old. Join a couple of groups that meet regularly, follow an old hobby, take up a new one, learn a new skill.
Money? Get advice from the Citizen's Advice Bureau on finance.