Is it permissible to perform the 'Aqiqah for children after they have reached the age of four, and is it permissible to slaughter it and donate its meat outside their country of birth due to the absence of the poor there?

There is no harm in slaughtering the Aqiqah for children, even if their age exceeds four years. It is permissible to slaughter it in the country where they were born or in another country. It is recommended to eat from it, give some in charity, and present some as gifts.