Hi lellibet. Go ahead and do what you feel's right for you. My mother was pregnant naturally at 52, and again at 55! She lost the first, and thought that when her periods stopped the second time, it was definitely due to the menopause.
She'd sailed through previous pregnancies, but felt ill with the last one, so had a pregnancy test when her sickliness continued. She almost had a heart attack when she was given the news, and felt that she couldn't possibly bring a child into the world at that age.
The termination was early, and carried out chemically (tablets). Although there's always been a tinge of regret, she feels that what she did was appropriate under the circumstances.
The only person who can decide, is yourself. Best of luck with your decision.