The watch you should wear at every age:

18:
>Tissot or Citizen
Blue Moon hits different. You're early. This is the right move.
20–25:
>Grand Seiko. Tudor. Tag Heuer.
You figured something out. The wrist shows it.
30:
>At minimum, a Rolex.
Submariner if you're cool. Daytona if you mean it.
40:
>Two Richard Milles. One per wrist.
No explanation needed.
50:
>Audemars Piguet or Patek Philippe.
You are loooking for an Old Money Look.
Bonus: Seiko mods are cringe.