So the advice of an older mind may be helpful.

Still, inside that lovely young body was an ugly old mind.

Troi had never met anyone so young with such an old mind.

All this meant little or nothing to our six-year old minds.

Perhaps his sluggish old mind hadn't seen her adulthood coming so fast.

He couldn't quite fit into this body or deal with the older mind he now had.

But he did have the right of first comment, no matter how silly his old mind might be.

"In that young head an old mind you have," he said slowly.

I know your poor old mind has taken a beating, but I'm here with you now and you'll soon be fine again.

Her mind felt ancient suddenly, an old mind in a young body.