My DM (89) buys about 50 cards and sends them to all sorts of friends from the past to 'keep in touch'.
I buy about 30 cards to send to people who will be upset not to receive one (DM, D Aunt etc) and a few friends from the past. I am in my 60s.
DD (39) doesn't buy any cards except for my DM.
If we are typical, then giving Christmas cards will die out before long.
Do you buy lots of cards, and how old are you?