Sorry but to comment that the person is quite old does not sound like a valid reason. If this person has no intention of becoming a mother, why not use contraception? If she is old, then seems immature, selfish and irresponsible in her act.
When I conceived last year, I fall into the 35-40 year old group and worried of having a down syndrome baby and all kinds pregnancy complications that a high-risk age group women might face. I know I am carrying a LIVE so I have decided to go through all pregnancy tests (regardless of the costs) to make sure that the baby is not down syndrome and throughout my pregnancy, I make sure that I maintain a healthy diet and not to take unnecessary risk to loss the baby (later than confirmed that she is normal).
I can never comprehend how can someone just simply wants to abort a baby because of age. Hope guilt will not haunt her if she aborted the baby not due to health issues.