Meaning of the word "beware of the young doctor and the old barber" in English

What does "beware of the young doctor and the old barber" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

beware of the young doctor and the old barber

US /bɪˈwer ʌv ðə jʌŋ ˈdɑːk.tɚ ænd ðə oʊld ˈbɑːr.bɚ/
UK /bɪˈweər ɒv ðə jʌŋ ˈdɒk.tər ænd ðə əʊld ˈbɑː.bər/
"beware of the young doctor and the old barber" picture

Idiom

a proverb suggesting that inexperience in a doctor and a decline in physical precision in an old barber can be dangerous

Example:
My grandfather always said, 'Beware of the young doctor and the old barber,' because he valued experience in medicine and steady hands in grooming.
While modern training is rigorous, the old proverb beware of the young doctor and the old barber reminds us that practice makes perfect.