Congratulations, and/or condolences as appropriate. You're only about seven years behind NicknamedSue and me.
We've been fortunate; we skipped having children and went directly to having two wonderful grandchildren, elsewhere described as Teen1 and Teen2.
Teen2 is the youngest, and she will officially no longer be a teenager on Saturday. (You'll note we chose Ronald Reagan's birthday.)
Coming from you, that makes perfect sense.