What it means
The first impression is openness, goodwill, scale; people want to trust you. Much in life opens thanks to personal confidence. The body tends toward fullness with the years.
The flip side is overestimating yourself and promises beyond your strength; it is hard to keep a measure.
Not about you if from the first meeting you are seen as a reserved, closed person.
How to check it on yourself
Check it against your past — write your answer down before you look at the chart.
If you have Jupiter in the 1st house
What should match. Ask two or three acquaintances about their first impression. At least two will say openness, goodwill or confidence.
When it’s not about you. Two of the three will remember reserve or coldness — then this is not about you.
Your sign and house of Jupiter — in the free calculation: build my chart. How we check the rest — the site’s method.