I'd like to know what the latter part of this mean. Can it really be possible that the subject of "being so young..." is "he(him)"?

it must hit him hard, being so young and all.

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"It must be difficult for him to be young and everything that being young means (not experienced, maybe not independent, weak?, etc)".
This is how I read it, but difficult to get a better sense of the meaning without more context.