Develop a comfortable cushion of savings -- 3 months' salary wouldn't be too bad to start with -- and then try the other job out, if you can.

Have you ever watched people get older?

Some people, as they get older, stay really dynamic. Their minds are sharp, they're active, they "age well". Other people just get old, their minds get dull and narrow, they begin to define themselves in terms of all the things they can't do.

The only difference between the two is that members of the first group go out and challenge themselves all the time, trying new hobbies (or staying active in current ones), working on the house, in the yard, etc. -- even when it's hard.

I think that's probably important for young people, too.

So don't stay too comfortable for too long.