What does "six months his junior" mean?

Question

I was on imdb.com, looking up d**k van d**e, and this came up:

Played Lionel Jeffries's son in Chitty Chitty Bang Bang (1968) even though Jeffries is actually six months his junior.

what does that mean?????

Answer 1

it means he is six months younger

Answer 2

Lionel is actually six months younger than d**k van d**e

Answer 3

6 months younger than whomever is talking

Answer 4

It means that Jeffries was six months younger than d**k Van d**e.

Answer 5

it means Jeffries is six months younger than him

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Answer 6

Van d**e played Jeffries' son in the movie, even though Jeffries is actually six months younger than Van d**e.

Answer 7

Means six months younger than d**k