Theo and the Older Woman - S2-E5
Corrected entry: This episode takes place before Halloween, and Theo is 15. This puts his birthday before October. In season 1, on Thanksgiving (episode 10 "Bonjour Sondra") Theo is 14. Later on in the show in the following year, the family celebrates Cliff's Birthday which is in October (Cliff mentions this in the episode "Fathers day") and Theo is still 14. How could he have been the same age when a full year went by?
Correction: Theo's birthday was noted to be October 21st (before Halloween). Cliff's Birthday is in October and would be before the 21st, so Theo would still be 14, although about to turn 15.
Bishop73