To the person celebrating the birthday, it is always a personal day especially if it is one of those milestone ages. The person you are getting the card for should be able to relate to the words you use. If the person is close to you, take into consideration the way they are taking the whole birthday.

Words that relate to what is currently going on in their lives are also appropriate for a birthday card. If the person has just received a promotion at work, you can use happy, funny and exciting words but if the person has recently lost a loved one, it is not appropriate to include words that refer to death and old age. It is important to use words that make the person feel unique and special on their birthday through the card you send them.

Witty words about age are also a great idea when writing a birthday card since they make the person laugh at themselves but you should be very careful when joking about age unless you know for sure that the person does not mind.

Always include some apologetic words especially if you sending the card after the birthday has passed.