Card shopping is harder than you think. The selection process depends on the receiver’s current state (physical and mental), temperament, and your relationship with that person.
The objective of a card is to break the mold without sensationalizing the message. Funny cards about someone’s age are touchy. Serious cards about love and health are dull.
You’re better off buying something vague enough to spark a smile and make one optimistic. A simple joke or adage usually sends the right message.