Rough figure, in aviation field with mandatory contributions you are around 25% of social charges (Social security, retirement, unemployment, etc..) to be withdrawn from your gross, so you will get around 90000, from this your tax bracket is 41% so you end with 53000 take home.
BUT now come the deductions, married , 2 kids,
you will be credited back of some 10000, so at the end it will be like 63000 net /net per annum so 5250€..
From this you will have to pay house tax and other things ( depending on where you are living) but on this salary you can plan another 6000€/year
And remember you pay the year AFTER ! So you have to save for you to pay this sum later.
The state pension works if you have contributed to the system for around 40 years (+/-) or it is more or less a total loss, and then it is capped to a maximum. You have to contribute to an external scheme.