At a tender age
Definition 1 of 1
Pro Tip 1/3Young Innocence
Highlights the idea of innocence or vulnerability associated with youth. 
He was exposed to the hardships of life at a tender age.
Pro Tip 2/3Early Development
Refers to learning or developing skills sooner than usual. 
Her maturity was evident, having dealt with responsibilities at a tender age.
Pro Tip 3/3Impressionable Period
Used when someone is easily influenced because they're young. 
Marketers often target kids at a tender age to cultivate brand loyalty.