The meaning of FIRE is Financial Independence, Retire Early that is the meaning of FIRE.

30 years ago, when I started my first job.

'start' is present test, 'started' is past tense

The colleague sitting next to me had already said the same thing.

I will retire at the age early 30 (our age wasin my early 30's (we were in our early 20's) and travel the world…

Also, for a specific age, say "age of ___"
For example
"I will retire at the age of 32"

I was young and especially stupid, so I believed that iwas my dream too!

Some years later we were both working in another company.

I never contacted him but I am sure he didn’t achieve his “dream”.

Me tooneither!

Because it was something that did not happen, you can use 'neither' instead.
For example:
"He achieved his dream. Me too!"
"He did not achieve his dream. Me neither!"

So, if you have just stepped out school and started your first job.

I will tell you don’t follow “FIRE”, is at is wishful thinking!