I’m not old enough for this!  そこまでは歳をとっていない!

Today I thought I’d reverse last week’s phrase (I’m getting too old for this).  So we can say:

I’m not old enough to have gray hair already!

It’s not cool enough to go camping.

Donald Trump is not smart enough to be the President.

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I’m not rich enough to retire . . . . .yet.

I’m not thin enough to wear these jeans . .  .YET!

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Try to make some of your own sentences.  I’ll be looking forward to hearing them.