Answer:
Dear Mr. and Mrs. (insert regu's last name)
I regret to inform you that we have been missing Regu in our classes for some time now. Skipping classes is unacceptable and will be punished if this continues.
Sincerely,
Y/n
i coulsnt tell yeah sorry dude hhahahahahahhah
I'm not going to write the letter for your 45 year-old self obviously but start by saying "How has the journey been so far". Consider all the factors like having your children being the age you are now. At 45 you may be a lot more smart, definitely more wealthy. Wish yourself luck no matter how blank the future may be, etc.
C a well supported appeal to logic