And she was a widow of about fourscore and four years - That is, she was about 84 years of age. It does not mean that she had been a widow for that long time.
Fastings and prayers - Constant religious service. pending her time in prayer, and in all the ordinances of religion.
Night and day - Continually - that is, at the usual times of public worship and in private. When it is said that she departed not from the temple, it is meant that she was “constant” and “regular” in all the public services at the temple, or was never absent from those services. God blesses those who wait at his temple gates.