The Adventures of Figaro Pho S01E21 - Fear of Growing Old (Gerontophobia)

When Figaro wakes up with an old man's cough and a sore back, he becomes terrified that he's aged rapidly.
Figaro decides to fight it and act young. As this fails hilariously, our fearful hero instantly turns into a wrinkly old man.
Only When Dotty falls in love with him at the bus stop he snaps out of it, leaving her behind wrinkled and broken hearted.