The fact that Friends' final episode aired almost two decades ago is genuinely startling.

In addition to making us feel very old, it serves as a timely reminder that everyone ages, including your favourite fictional characters.

The six friends have reunited for a very emotional reunion episode, and while they may have changed somewhat in appearance, they are the same people.

When the first episode aired, Jennifer Aniston was 25 years old; she is now 52. This year, Courteney Cox, who was 30 at the time, turns 56.

Lisa Kudrow, who was 31 during the show's debut season, was the oldest cast member at the time.

When the programme originally began, Joey, played by Matt LeBlanc, was 27 years old. He is now 53.

 This year, David Schwimmer (Ross), who played Ross, turns 55 years old. The youngest, 25-year-old Matthew Perry (Chandler), will turn 52 this year.

Kudrow has said in various interviews that she has generally avoided plastic surgery because she has been too terrified to try it.

I'm too terrified to undergo plastic surgery, Botox, or fillers. It doesn't mean I won't do it, but the whole thing makes me feel a little too anxious.

When someone smiles, I believe they are all gorgeous. So I strive to be joyful.