Anamika; I do not think Nepalese Embassy will be helpful on this matter but it is okay to check.

Sincerely, none of us let the embassy know when you flying in and out so it may be worthless to check. 

If you know your elderly family has to travel alone going back, you must buy a ticket that is refundable and you should be ready to buy a ticket matching to traveler air carrier. 

It is not always true that people try to avoid elderly people.