Indicates someone is relatively young but not necessarily youthful or a teenager. At the family gathering, Aunt Julia was the youngish member of her generation.
Pro Tip 2/3
Not Quite Middle-Aged
Used to describe someone who is older than a youth but not old enough to be considered middle-aged. The youngish professor had innovative ideas that appealed to her students.
Pro Tip 3/3
Unspecific Age
It's a vague term avoiding the specification of an exact age, but suggests a lean towards youth. When asked about his age, he replied with a smile, 'I'm youngish.'