Impressionable (adjective)
Being easily influenced (especially of young people).
Impressionable (noun)
An impressionable person.
Impressible (adjective)
Capable of being impressed; susceptible of receiving impression.
Impressible (adjective)
Capable of creating an impression.
Wiktionary
Impressionable (adjective)
easily influenced
“children are highly impressionable and susceptible to advertising”
Oxford Dictionary