By the time you know what to do, you're too old to do it.

If you don't think too good, don't think too much.

By the time you're eighty years old you've learned everything. You only have to remember it.

By the time you know what to do, you're too old to do it.

By the time we've made it, we've had it.

I was in 20 Shakespearean plays by the time I was 20.