When will you "call it a day"

[yawetag]

I'm turning 30 this week, so I'm far away from even thinking about stopping for age reasons.

Like the others, however, I'll quit when it's no longer fun. I've had other interests in the past and I gave them up, or cut the down, when the fun was no longer there. I still enjoy some of those hobbies, but not nearly as much as before.

Right now, umpiring is tons of fun -- at all levels. I'm sure I'll be tired of it one day, but that day isn't even on the radar right now.