the person...

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He has enough energy and stamina to complete many issues until the end.

Since the chin also reflects heart health... it means like this chin

That person's heart is in good health.

She/he can cope with difficult periods and create opportunities which is why she/he is likely to have major accomplishments.

However... such a chin means that the person...

Stubborn and unlikely to stay in a long-term love relationship with the same person

In general... a prominent chin means good chances of luck in advanced years for both genders.