From the Age UK website:
"The expert view:
Dr Liz Green says: 'Older patients should not routinely supplement with iron unless they have a known reason for any iron deficiency, for instance if they have just had an operation or suffered blood loss or are vegan.
'Also, iron deficiency in patients over 50 can be the first sign of an underlying health problem, so would we always want to investigate this fully.'
Fortunately, there are a couple of simple ways to improve iron absorption without taking a supplement. Priya Tew says: 'Drinking tea and coffee with a meal will reduce the amount of iron absorbed to keep these drinks to in-between meals.
'To boost iron absorption, have plenty of vitamin C in your diet and try having a glass or fruit juice with an iron-rich meal.' "
http://www.ageuk.org.uk/health-wellbeing/healthy-eating-landing/vitamins-for-older-people/