My older son, Jens, is 23 today.
People who know ask if I have sent him a card and present or called him. Jens has asked his grandparents and me to resist sending him a card or presents until he is back on shore in early July. I have bought a card and picked out presents.
I have not called him. Although he has great cellular phone coverage, the signal does not carry to underwater in the Pacific Ocean. If you are so inclined, you can send birthday greetings to Jens at firstname.lastname@example.org